AtomicGameEngine/Source/ThirdParty/TurboBadger/tb_widgets.cpp

// ================================================================================
// ==      This file is a part of Turbo Badger. (C) 2011-2014, Emil Segerås      ==
// ==                     See tb_core.h for more information.                    ==
// ================================================================================

#include "tb_widgets.h"
#include "tb_window.h"
#include "tb_widgets_listener.h"
#include "tb_renderer.h"
#include "tb_widgets_common.h"
#include "tb_widget_skin_condition_context.h"
#include "tb_system.h"
#include "tb_scroller.h"
#include "tb_font_renderer.h"
#include <assert.h>
#ifdef TB_ALWAYS_SHOW_EDIT_FOCUS
#include "tb_editfield.h"
#endif // TB_ALWAYS_SHOW_EDIT_FOCUS

namespace tb {

//static data
TBWidget *TBWidget::hovered_widget = nullptr;
TBWidget *TBWidget::captured_widget = nullptr;
TBWidget *TBWidget::focused_widget = nullptr;
int TBWidget::pointer_down_widget_x = 0;
int TBWidget::pointer_down_widget_y = 0;
int TBWidget::pointer_move_widget_x = 0;
int TBWidget::pointer_move_widget_y = 0;
bool TBWidget::cancel_click = false;
bool TBWidget::update_widget_states = true;
bool TBWidget::update_skin_states = true;
bool TBWidget::show_focus_state = false;

// == TBLongClickTimer ==================================================================

/** One shot timer for long click event */
class TBLongClickTimer : private TBMessageHandler
{
public:
    TBLongClickTimer(TBWidget *widget, bool touch) : m_widget(widget), m_touch(touch)
    {
        PostMessageDelayed(TBIDC("TBLongClickTimer"), nullptr, TBSystem::GetLongClickDelayMS());
    }
    virtual void OnMessageReceived(TBMessage *msg)
    {
        assert(msg->message == TBIDC("TBLongClickTimer"));
        m_widget->MaybeInvokeLongClickOrContextMenu(m_touch);
    }
private:
    TBWidget *m_widget;
    bool m_touch;
};

// == TBWidget::PaintProps ==============================================================

TBWidget::PaintProps::PaintProps()
{
    // Set the default properties, used for the root widgets
    // calling InvokePaint. The base values for all inheritance.
    text_color = g_tb_skin->GetDefaultTextColor();
}

// == TBWidget ==========================================================================

TBWidget::TBWidget()
    : m_parent(nullptr)
    , m_opacity(1.f)
    , m_state(WIDGET_STATE_NONE)
    , m_gravity(WIDGET_GRAVITY_DEFAULT)
    , m_layout_params(nullptr)
    , m_scroller(nullptr)
    , m_long_click_timer(nullptr)
    , m_delegate(nullptr)
    , m_packed_init(0)
    , needCapturing_(true)
    , captured_(false)
    , shortened_(false)
{
#ifdef TB_RUNTIME_DEBUG_INFO
    last_measure_time = 0;
    last_layout_time = 0;
#endif // TB_RUNTIME_DEBUG_INFO
}

TBWidget::~TBWidget()
{
    assert(!m_parent); ///< A widget must be removed from parent before deleted
    m_packed.is_dying = true;

    if (this == hovered_widget)
        hovered_widget = nullptr;
    if (this == captured_widget)
        captured_widget = nullptr;
    if (this == focused_widget)
        focused_widget = nullptr;

    if (m_delegate)
        m_delegate->OnDelete();

    m_delegate = NULL;

    TBWidgetListener::InvokeWidgetDelete(this);
    DeleteAllChildren();

    delete m_scroller;
    delete m_layout_params;

    StopLongClickTimer();

    assert(!m_listeners.HasLinks()); // There's still listeners added to this widget!
}

void TBWidget::SetRect(const TBRect &rect)
{
    if (m_rect.Equals(rect))
        return;

    TBRect old_rect = m_rect;
    m_rect = rect;

    if (old_rect.w != m_rect.w || old_rect.h != m_rect.h)
        OnResized(old_rect.w, old_rect.h);

    Invalidate();
}

void TBWidget::Invalidate()
{
    if (!GetVisibilityCombined() && !m_rect.IsEmpty())
        return;
    TBWidget *tmp = this;
    while (tmp)
    {
        tmp->OnInvalid();
        tmp = tmp->m_parent;
    }
}

void TBWidget::InvalidateStates()
{
    update_widget_states = true;
    InvalidateSkinStates();
}

void TBWidget::InvalidateSkinStates()
{
    update_skin_states = true;
}

void TBWidget::Die()
{
    if (m_packed.is_dying)
        return;
    m_packed.is_dying = true;
    OnDie();
    if (!TBWidgetListener::InvokeWidgetDying(this))
    {
        // No one was interested, so die immediately.
        if (m_parent)
            m_parent->RemoveChild(this);
        delete this;
    }
}

TBWidget *TBWidget::GetWidgetByIDInternal(const TBID &id, const TB_TYPE_ID type_id)
{
    if (m_id == id && (!type_id || IsOfTypeId(type_id)))
        return this;
    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
    {
        if (TBWidget *sub_child = child->GetWidgetByIDInternal(id, type_id))
            return sub_child;
    }
    return nullptr;
}

TBWidget *TBWidget::GetWidgetByTouchId(unsigned touchId)
{
    if (IsCaptured() && touchId_ == touchId)
        return this;
    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
    {
        if (TBWidget *sub_child = child->GetWidgetByTouchId(touchId))
            return sub_child;
    }
    return nullptr;
}

TBStr TBWidget::GetTextByID(const TBID &id)
{
    if (TBWidget *widget = GetWidgetByID(id))
        return widget->GetText();
    return "";
}

int TBWidget::GetValueByID(const TBID &id)
{
    if (TBWidget *widget = GetWidgetByID(id))
        return widget->GetValue();
    return 0;
}

void TBWidget::SetID(const TBID &id)
{
    m_id = id;
    InvalidateSkinStates();
}

void TBWidget::SetStateRaw(WIDGET_STATE state)
{
    if (m_state == state)
        return;
    m_state = state;
    Invalidate();
    InvalidateSkinStates();
}

void TBWidget::SetState(WIDGET_STATE state, bool on)
{
    SetStateRaw(on ? m_state | state : m_state & ~state);
}

WIDGET_STATE TBWidget::GetAutoState() const
{
    WIDGET_STATE state = m_state;
    bool add_pressed_state = !cancel_click && (captured_ || this == captured_widget);
    if (add_pressed_state)
        state |= WIDGET_STATE_PRESSED;
    if (this == hovered_widget && (!m_packed.no_automatic_hover_state || add_pressed_state))
        state |= WIDGET_STATE_HOVERED;
    if (this == focused_widget && show_focus_state)
        state |= WIDGET_STATE_FOCUSED;
#ifdef TB_ALWAYS_SHOW_EDIT_FOCUS
    else if (this == focused_widget && IsOfType<TBEditField>())
        state |= WIDGET_STATE_FOCUSED;
#endif
    return state;
}

//static
void TBWidget::SetAutoFocusState(bool on)
{
    if (show_focus_state == on)
        return;
    show_focus_state = on;
    if (focused_widget)
        focused_widget->Invalidate();
}

void TBWidget::SetOpacity(float opacity)
{
    opacity = Clamp(opacity, 0.f, 1.f);
    if (m_opacity == opacity)
        return;
    if (opacity == 0) // Invalidate after setting opacity 0 will do nothing.
        Invalidate();
    m_opacity = opacity;
    Invalidate();
}

void TBWidget::SetVisibilility(WIDGET_VISIBILITY vis)
{
    if (m_packed.visibility == vis)
        return;

    // Invalidate after making it invisible will do nothing.
    if (vis != WIDGET_VISIBILITY_VISIBLE)
        Invalidate();
    if (vis == WIDGET_VISIBILITY_GONE)
        InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);

    WIDGET_VISIBILITY old_vis = GetVisibility();
    m_packed.visibility = vis;

    Invalidate();
    if (old_vis == WIDGET_VISIBILITY_GONE)
        InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);

    OnVisibilityChanged();
}

WIDGET_VISIBILITY TBWidget::GetVisibility() const
{
    return static_cast<WIDGET_VISIBILITY>(m_packed.visibility);
}

bool TBWidget::GetVisibilityCombined() const
{
    const TBWidget *tmp = this;
    while (tmp)
    {
        if (tmp->GetOpacity() == 0 || tmp->GetVisibility() != WIDGET_VISIBILITY_VISIBLE)
            return false;
        tmp = tmp->m_parent;
    }
    return true;
}

bool TBWidget::GetDisabled() const
{
    const TBWidget *tmp = this;
    while (tmp)
    {
        if (tmp->GetState(WIDGET_STATE_DISABLED))
            return true;
        tmp = tmp->m_parent;
    }
    return false;
}

void TBWidget::AddChild(TBWidget *child, WIDGET_Z z, WIDGET_INVOKE_INFO info)
{
    AddChildRelative(child, z == WIDGET_Z_TOP ? WIDGET_Z_REL_AFTER : WIDGET_Z_REL_BEFORE, nullptr, info);
}

void TBWidget::AddChildRelative(TBWidget *child, WIDGET_Z_REL z, TBWidget *reference, WIDGET_INVOKE_INFO info)
{
    assert(!child->m_parent);
    child->m_parent = this;

    if (reference)
    {
        if (z == WIDGET_Z_REL_BEFORE)
            m_children.AddBefore(child, reference);
        else
            m_children.AddAfter(child, reference);
    }
    else // If there is no reference widget, before means first and after means last.
    {
        if (z == WIDGET_Z_REL_BEFORE)
            m_children.AddFirst(child);
        else
            m_children.AddLast(child);
    }

    if (info == WIDGET_INVOKE_INFO_NORMAL)
    {
        OnChildAdded(child);
        child->OnAdded();
        TBWidgetListener::InvokeWidgetAdded(this, child);
    }
    InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);
    Invalidate();
    InvalidateSkinStates();
}

void TBWidget::RemoveChild(TBWidget *child, WIDGET_INVOKE_INFO info)
{
    assert(child->m_parent);

    if (info == WIDGET_INVOKE_INFO_NORMAL)
    {
        // If we're not being deleted and delete the focused widget, try
        // to keep the focus in this widget by moving it to the next widget.
        if (!m_packed.is_dying && child == focused_widget)
            m_parent->MoveFocus(true);

        OnChildRemove(child);
        child->OnRemove();
        TBWidgetListener::InvokeWidgetRemove(this, child);
    }

    m_children.Remove(child);
    child->m_parent = nullptr;

    InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);
    Invalidate();
    InvalidateSkinStates();
}

void TBWidget::DeleteAllChildren()
{
    while (TBWidget *child = GetFirstChild())
    {
        RemoveChild(child);
        delete child;
    }
}

void TBWidget::SetZ(WIDGET_Z z)
{
    if (!m_parent)
        return;
    if (z == WIDGET_Z_TOP && this == m_parent->m_children.GetLast())
        return; // Already at the top
    if (z == WIDGET_Z_BOTTOM && this == m_parent->m_children.GetFirst())
        return; // Already at the top
    TBWidget *parent = m_parent;
    parent->RemoveChild(this, WIDGET_INVOKE_INFO_NO_CALLBACKS);
    parent->AddChild(this, z, WIDGET_INVOKE_INFO_NO_CALLBACKS);
}

void TBWidget::SetGravity(WIDGET_GRAVITY g)
{
    if (m_gravity == g)
        return;
    m_gravity = g;
    InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);
}

void TBWidget::SetSkinBg(const TBID &skin_bg, WIDGET_INVOKE_INFO info)
{
    if (skin_bg == m_skin_bg)
        return;

    // Set the skin and m_skin_bg_expected. During InvokeProcess, we will detect
    // if any widget get a different element due to conditions and strong override.
    // If that happens, OnSkinChanged will be called and m_skin_bg_expected updated to
    // match that override.
    m_skin_bg = skin_bg;
    m_skin_bg_expected = skin_bg;

    Invalidate();
    InvalidateSkinStates();
    InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);

    if (info == WIDGET_INVOKE_INFO_NORMAL)
        OnSkinChanged();
}

TBSkinElement *TBWidget::GetSkinBgElement()
{
    TBWidgetSkinConditionContext context(this);
    WIDGET_STATE state = GetAutoState();
    return g_tb_skin->GetSkinElementStrongOverride(m_skin_bg, static_cast<SKIN_STATE>(state), context);
}

TBWidget *TBWidget::FindScrollableWidget(bool scroll_x, bool scroll_y)
{
    TBWidget *candidate = this;
    while (candidate)
    {
        ScrollInfo scroll_info = candidate->GetScrollInfo();
        if ((scroll_x && scroll_info.CanScrollX()) ||
                (scroll_y && scroll_info.CanScrollY()))
            return candidate;
        candidate = candidate->GetParent();
    }
    return nullptr;
}

TBScroller *TBWidget::FindStartedScroller()
{
    TBWidget *candidate = this;
    while (candidate)
    {
        if (candidate->m_scroller && candidate->m_scroller->IsStarted())
            return candidate->m_scroller;
        candidate = candidate->GetParent();
    }
    return nullptr;
}

TBScroller *TBWidget::GetReadyScroller(bool scroll_x, bool scroll_y)
{
    if (TBScroller *scroller = FindStartedScroller())
        return scroller;
    // We didn't have any active scroller, so create one for the nearest scrollable parent.
    if (TBWidget *scrollable_widget = FindScrollableWidget(scroll_x, scroll_y))
        return scrollable_widget->GetScroller();
    return nullptr;
}

TBScroller *TBWidget::GetScroller()
{
    if (!m_scroller)
        m_scroller = new TBScroller(this);
    return m_scroller;
}

void TBWidget::ScrollToSmooth(int x, int y)
{
    ScrollInfo info = GetScrollInfo();
    int dx = x - info.x;
    int dy = y - info.y;
    if (TBScroller *scroller = GetReadyScroller(dx != 0, dy != 0))
        scroller->OnScrollBy(dx, dy, false);
}

void TBWidget::ScrollBySmooth(int dx, int dy)
{
    // Clip the values to the scroll limits, so we don't
    // scroll any parents.
    //int x = CLAMP(info.x + dx, info.min_x, info.max_x);
    //int y = CLAMP(info.y + dy, info.min_y, info.max_y);
    //dx = x - info.x;
    //dy = y - info.y;
    if (!dx && !dy)
        return;

    if (TBScroller *scroller = GetReadyScroller(dx != 0, dy != 0))
        scroller->OnScrollBy(dx, dy, true);
}

void TBWidget::ScrollBy(int dx, int dy)
{
    ScrollInfo info = GetScrollInfo();
    ScrollTo(info.x + dx, info.y + dy);
}

void TBWidget::ScrollByRecursive(int &dx, int &dy)
{
    TBWidget *tmp = this;
    while (tmp)
    {
        ScrollInfo old_info = tmp->GetScrollInfo();
        tmp->ScrollTo(old_info.x + dx, old_info.y + dy);
        ScrollInfo new_info = tmp->GetScrollInfo();
        dx -= new_info.x - old_info.x;
        dy -= new_info.y - old_info.y;
        if (!dx && !dy)
            break;
        tmp = tmp->m_parent;
    }
}

void TBWidget::ScrollIntoViewRecursive()
{
    TBRect scroll_to_rect = m_rect;
    TBWidget *tmp = this;
    while (tmp->m_parent)
    {
        tmp->m_parent->ScrollIntoView(scroll_to_rect);
        scroll_to_rect.x += tmp->m_parent->m_rect.x;
        scroll_to_rect.y += tmp->m_parent->m_rect.y;
        tmp = tmp->m_parent;
    }
}

void TBWidget::ScrollIntoView(const TBRect &rect)
{
    const ScrollInfo info = GetScrollInfo();
    int new_x = info.x;
    int new_y = info.y;

    const TBRect visible_rect = GetPaddingRect().Offset(info.x, info.y);

    if (rect.y <= visible_rect.y)
        new_y = rect.y;
    else if (rect.y + rect.h > visible_rect.y + visible_rect.h)
        new_y = rect.y + rect.h - visible_rect.h;

    if (rect.x <= visible_rect.x)
        new_x = rect.x;
    else if (rect.x + rect.w > visible_rect.x + visible_rect.w)
        new_x = rect.x + rect.w - visible_rect.w;

    ScrollTo(new_x, new_y);
}

bool TBWidget::SetFocus(WIDGET_FOCUS_REASON reason, WIDGET_INVOKE_INFO info)
{
    if (focused_widget == this)
        return true;
    if (GetDisabled() || !GetIsFocusable() || !GetVisibilityCombined() || GetIsDying())
        return false;

    // Update windows last focus
    TBWindow *window = GetParentWindow();
    if (window)
    {
        window->SetLastFocus(this);
        // If not active, just return. We should get focus when the window is activated.
        // Exception for windows that doesn't activate. They may contain focusable widgets.
        if (!window->IsActive() && (window->GetSettings() & WINDOW_SETTINGS_CAN_ACTIVATE))
            return true;
    }

    if (focused_widget)
    {
        focused_widget->Invalidate();
        focused_widget->InvalidateSkinStates();
    }

    TBWidgetSafePointer old_focus(focused_widget);
    focused_widget = this;

    Invalidate();
    InvalidateSkinStates();

    if (reason == WIDGET_FOCUS_REASON_NAVIGATION)
        ScrollIntoViewRecursive();

    if (info == WIDGET_INVOKE_INFO_NORMAL)
    {
        // A lot of weird bugs could happen if people mess with focus from OnFocusChanged.
        // Take some precaution and detect if it change again after OnFocusChanged(false).
        if (TBWidget *old = old_focus.Get())
        {
            // The currently focused widget still has the pressed state set by the emulated click
            // (By keyboard), so unset it before we unfocus it so it's not stuck in pressed state.
            if (old->m_packed.has_key_pressed_state)
            {
                old->SetState(WIDGET_STATE_PRESSED, false);
                old->m_packed.has_key_pressed_state = false;
            }
            old->OnFocusChanged(false);
        }
        if (old_focus.Get())
            TBWidgetListener::InvokeWidgetFocusChanged(old_focus.Get(), false);
        if (focused_widget && focused_widget == this)
            focused_widget->OnFocusChanged(true);
        if (focused_widget && focused_widget == this)
            TBWidgetListener::InvokeWidgetFocusChanged(focused_widget, true);
    }
    return true;
}

bool TBWidget::SetFocusRecursive(WIDGET_FOCUS_REASON reason)
{
    // Search for a child widget that accepts focus
    TBWidget *child = GetFirstChild();
    while (child)
    {
        if (child->SetFocus(WIDGET_FOCUS_REASON_UNKNOWN))
            return true;
        child = child->GetNextDeep(this);
    }
    return false;
}

bool TBWidget::MoveFocus(bool forward)
{
    TBWidget *origin = focused_widget;
    if (!origin)
        origin = this;

    TBWidget *root = origin->GetParentWindow();
    if (!root)
        root = origin->GetParentRoot();

    if (root == origin)
        return false;

    TBWidget *current = origin;
    while (current)
    {
        current = forward ? current->GetNextDeep() : current->GetPrevDeep();
        // Wrap around if we reach the end/beginning
        if (!current || !root->IsAncestorOf(current))
            current = forward ? root->GetFirstChild() : root->GetLastLeaf();
        // Break if we reached the origin again (we're not finding anything else)
        if (current == origin)
            break;
        // Try to focus what we found
        if (current && current->SetFocus(WIDGET_FOCUS_REASON_NAVIGATION))
            return true;
    }
    return false;
}

TBWidget *TBWidget::GetNextDeep(const TBWidget *bounding_ancestor) const
{
    if (m_children.GetFirst())
        return GetFirstChild();
    for (const TBWidget *widget = this; widget != bounding_ancestor; widget = widget->m_parent)
        if (widget->next)
            return widget->GetNext();
    return nullptr;
}

TBWidget *TBWidget::GetPrevDeep() const
{
    if (!prev)
        return m_parent;
    TBWidget *widget = GetPrev();
    while (widget->m_children.GetLast())
        widget = widget->GetLastChild();
    return widget;
}

TBWidget *TBWidget::GetLastLeaf() const
{
    if (TBWidget *widget = GetLastChild())
    {
        while (widget->GetLastChild())
            widget = widget->GetLastChild();
        return widget;
    }
    return nullptr;
}

bool TBWidget::GetIsInteractable() const
{
    return !(m_opacity == 0 || GetIgnoreInput() || GetState(WIDGET_STATE_DISABLED) ||
             GetIsDying() || GetVisibility() != WIDGET_VISIBILITY_VISIBLE);
}

WIDGET_HIT_STATUS TBWidget::GetHitStatus(int x, int y)
{
    if (!GetIsInteractable())
        return WIDGET_HIT_STATUS_NO_HIT;
    return x >= 0 && y >= 0 && x < m_rect.w && y < m_rect.h ? WIDGET_HIT_STATUS_HIT : WIDGET_HIT_STATUS_NO_HIT;
}

TBWidget *TBWidget::GetWidgetAt(int x, int y, bool include_children) const
{
    int child_translation_x, child_translation_y;
    GetChildTranslation(child_translation_x, child_translation_y);
    x -= child_translation_x;
    y -= child_translation_y;

    TBWidget *tmp = GetFirstChild();
    TBWidget *last_match = nullptr;
    while (tmp)
    {
        WIDGET_HIT_STATUS hit_status = tmp->GetHitStatus(x - tmp->m_rect.x, y - tmp->m_rect.y);
        if (hit_status)
        {
            if (include_children && hit_status != WIDGET_HIT_STATUS_HIT_NO_CHILDREN)
            {
                last_match = tmp->GetWidgetAt(x - tmp->m_rect.x, y - tmp->m_rect.y, include_children);
                if (!last_match)
                    last_match = tmp;
            }
            else
                last_match = tmp;
        }
        tmp = tmp->GetNext();
    }
    return last_match;
}

TBWidget *TBWidget::GetChildFromIndex(int index) const
{
    int i = 0;
    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
        if (i++ == index)
            return child;
    return nullptr;
}

int TBWidget::GetIndexFromChild(TBWidget *child) const
{
    assert(child->GetParent() == this);
    int i = 0;
    for (TBWidget *tmp = GetFirstChild(); tmp; tmp = tmp->GetNext(), i++)
        if (tmp == child)
            return i;
    return -1; ///< Should not happen!
}

bool TBWidget::IsAncestorOf(TBWidget *other_widget) const
{
    while (other_widget)
    {
        if (other_widget == this)
            return true;
        other_widget = other_widget->m_parent;
    }
    return false;
}

bool TBWidget::IsEventDestinationFor(TBWidget *other_widget) const
{
    while (other_widget)
    {
        if (other_widget == this)
            return true;
        other_widget = other_widget->GetEventDestination();
    }
    return false;
}

TBWidget *TBWidget::GetParentRoot()
{
    TBWidget *tmp = this;
    while (tmp->m_parent)
        tmp = tmp->m_parent;
    return tmp;
}

TBWindow *TBWidget::GetParentWindow()
{
    TBWidget *tmp = this;
    while (tmp && !tmp->IsOfType<TBWindow>())
        tmp = tmp->m_parent;
    return static_cast<TBWindow *>(tmp);
}

void TBWidget::AddListener(TBWidgetListener *listener)
{
    m_listeners.AddLast(listener);
}

void TBWidget::RemoveListener(TBWidgetListener *listener)
{
    m_listeners.Remove(listener);
}

bool TBWidget::HasListener(TBWidgetListener *listener) const
{
    return m_listeners.ContainsLink(listener);
}

void TBWidget::OnPaintChildren(const PaintProps &paint_props)
{
    if (!m_children.GetFirst())
        return;

    // Translate renderer with child translation
    int child_translation_x, child_translation_y;
    GetChildTranslation(child_translation_x, child_translation_y);
    g_renderer->Translate(child_translation_x, child_translation_y);

    TBRect clip_rect = g_renderer->GetClipRect();

    // Invoke paint on all children that are in the current visible rect.
    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
    {
        if (clip_rect.Intersects(child->m_rect))
            child->InvokePaint(paint_props);
    }

    // Invoke paint of overlay elements on all children that are in the current visible rect.
    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
    {
        if (clip_rect.Intersects(child->m_rect) && child->GetVisibility() == WIDGET_VISIBILITY_VISIBLE)
        {
            TBSkinElement *skin_element = child->GetSkinBgElement();
            if (skin_element && skin_element->HasOverlayElements())
            {
                // Update the renderer with the widgets opacity
                WIDGET_STATE state = child->GetAutoState();
                float old_opacity = g_renderer->GetOpacity();
                float opacity = old_opacity * child->CalculateOpacityInternal(state, skin_element);
                if (opacity > 0)
                {
                    g_renderer->SetOpacity(opacity);

                    TBWidgetSkinConditionContext context(child);
                    g_tb_skin->PaintSkinOverlay(child->m_rect, skin_element, static_cast<SKIN_STATE>(state), context);

                    g_renderer->SetOpacity(old_opacity);
                }
            }
        }
    }

    // Draw generic focus skin if the focused widget is one of the children, and the skin
    // doesn't have a skin state for focus which would already be painted.
    if (focused_widget && focused_widget->m_parent == this)
    {
        TBWidgetSkinConditionContext context(focused_widget);
        TBSkinElement *skin_element = focused_widget->GetSkinBgElement();
        if (!skin_element || !skin_element->HasState(SKIN_STATE_FOCUSED, context))
        {
            WIDGET_STATE state = focused_widget->GetAutoState();
            if (state & SKIN_STATE_FOCUSED)
                g_tb_skin->PaintSkin(focused_widget->m_rect, TBIDC("generic_focus"), static_cast<SKIN_STATE>(state), context);
        }
    }

    g_renderer->Translate(-child_translation_x, -child_translation_y);
}

void TBWidget::OnResized(int old_w, int old_h)
{
    int dw = m_rect.w - old_w;
    int dh = m_rect.h - old_h;
    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
    {
        if (child->GetVisibility() == WIDGET_VISIBILITY_GONE)
            continue;

        TBRect rect = child->m_rect;

        if ((child->m_gravity & WIDGET_GRAVITY_LEFT) && (child->m_gravity & WIDGET_GRAVITY_RIGHT))
            rect.w += dw;
        else if(child->m_gravity & WIDGET_GRAVITY_RIGHT)
            rect.x += dw;

        if ((child->m_gravity & WIDGET_GRAVITY_TOP) && (child->m_gravity & WIDGET_GRAVITY_BOTTOM))
            rect.h += dh;
        else if (child->m_gravity & WIDGET_GRAVITY_BOTTOM)
            rect.y += dh;

        child->SetRect(rect);
    }
}

void TBWidget::OnInflateChild(TBWidget *child)
{
    if (child->GetVisibility() == WIDGET_VISIBILITY_GONE)
        return;

    // If the child pull towards only one edge (per axis), stick to that edge
    // and use the preferred size. Otherwise fill up all available space.
    TBRect padding_rect = GetPaddingRect();
    TBRect child_rect = padding_rect;
    WIDGET_GRAVITY gravity = child->GetGravity();
    bool fill_x = (gravity & WIDGET_GRAVITY_LEFT) && (gravity & WIDGET_GRAVITY_RIGHT);
    bool fill_y = (gravity & WIDGET_GRAVITY_TOP) && (gravity & WIDGET_GRAVITY_BOTTOM);
    if (!fill_x || !fill_y)
    {
        PreferredSize ps = child->GetPreferredSize();
        if (!fill_x)
        {
            child_rect.w = ps.pref_w;
            if (gravity & WIDGET_GRAVITY_RIGHT)
                child_rect.x = padding_rect.x + padding_rect.w - child_rect.w;
        }
        if (!fill_y)
        {
            child_rect.h = ps.pref_h;
            if (gravity & WIDGET_GRAVITY_BOTTOM)
                child_rect.y = padding_rect.y + padding_rect.h - child_rect.h;
        }
    }
    child->SetRect(child_rect);
}

TBRect TBWidget::GetPaddingRect()
{
    TBRect padding_rect(0, 0, m_rect.w, m_rect.h);
    if (TBSkinElement *e = GetSkinBgElement())
    {
        padding_rect.x += e->padding_left;
        padding_rect.y += e->padding_top;
        padding_rect.w -= e->padding_left + e->padding_right;
        padding_rect.h -= e->padding_top + e->padding_bottom;
    }
    return padding_rect;
}

PreferredSize TBWidget::OnCalculatePreferredContentSize(const SizeConstraints &constraints)
{
    // The default preferred size is calculated to satisfy the children
    // in the best way. Since this is the default, it's probably not a
    // layouting widget and children are resized purely by gravity.

    // Allow this widget a larger maximum if our gravity wants both ways,
    // otherwise don't grow more than the largest child.
    bool apply_max_w = !((m_gravity & WIDGET_GRAVITY_LEFT) && (m_gravity & WIDGET_GRAVITY_RIGHT));
    bool apply_max_h = !((m_gravity & WIDGET_GRAVITY_TOP) && (m_gravity & WIDGET_GRAVITY_BOTTOM));
    bool has_layouting_children = false;
    PreferredSize ps;

    TBSkinElement *bg_skin = GetSkinBgElement();
    int horizontal_padding = bg_skin ? bg_skin->padding_left + bg_skin->padding_right : 0;
    int vertical_padding = bg_skin ? bg_skin->padding_top + bg_skin->padding_bottom : 0;
    SizeConstraints inner_sc = constraints.ConstrainByPadding(horizontal_padding, vertical_padding);

    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
    {
        if (child->GetVisibility() == WIDGET_VISIBILITY_GONE)
            continue;
        if (!has_layouting_children)
        {
            has_layouting_children = true;
            if (apply_max_w)
                ps.max_w = 0;
            if (apply_max_h)
                ps.max_h = 0;
        }
        PreferredSize child_ps = child->GetPreferredSize(inner_sc);
        ps.pref_w = MAX(ps.pref_w, child_ps.pref_w);
        ps.pref_h = MAX(ps.pref_h, child_ps.pref_h);
        ps.min_w = MAX(ps.min_w, child_ps.min_w);
        ps.min_h = MAX(ps.min_h, child_ps.min_h);
        if (apply_max_w)
            ps.max_w = MAX(ps.max_w, child_ps.max_w);
        if (apply_max_h)
            ps.max_h = MAX(ps.max_h, child_ps.max_h);
        ps.size_dependency |= child_ps.size_dependency;
    }

    return ps;
}

PreferredSize TBWidget::OnCalculatePreferredSize(const SizeConstraints &constraints)
{
    PreferredSize ps = OnCalculatePreferredContentSize(constraints);
    assert(ps.pref_w >= ps.min_w);
    assert(ps.pref_h >= ps.min_h);

    if (TBSkinElement *e = GetSkinBgElement())
    {
        // Override the widgets preferences with skin attributes that has been specified.
        // If not set by the widget, calculate based on the intrinsic size of the skin.

        const int skin_intrinsic_w = e->GetIntrinsicWidth();
        if (e->GetPrefWidth() != SKIN_VALUE_NOT_SPECIFIED)
            ps.pref_w = e->GetPrefWidth();
        else if (ps.pref_w == 0 && skin_intrinsic_w != SKIN_VALUE_NOT_SPECIFIED)
            ps.pref_w = skin_intrinsic_w;
        else
        {
            // Grow by padding to get the preferred size from preferred content size.
            ps.min_w += e->padding_left + e->padding_right;
            ps.pref_w += e->padding_left + e->padding_right;
        }

        const int skin_intrinsic_h = e->GetIntrinsicHeight();
        if (e->GetPrefHeight() != SKIN_VALUE_NOT_SPECIFIED)
            ps.pref_h = e->GetPrefHeight();
        else if (ps.pref_h == 0 && skin_intrinsic_h != SKIN_VALUE_NOT_SPECIFIED)
            ps.pref_h = skin_intrinsic_h;
        else
        {
            // Grow by padding to get the preferred size from preferred content size.
            ps.min_h += e->padding_top + e->padding_bottom;
            ps.pref_h += e->padding_top + e->padding_bottom;
        }

        if (e->GetMinWidth() != SKIN_VALUE_NOT_SPECIFIED)
            ps.min_w = e->GetMinWidth();
        else
            ps.min_w = MAX(ps.min_w, e->GetIntrinsicMinWidth());

        if (e->GetMinHeight() != SKIN_VALUE_NOT_SPECIFIED)
            ps.min_h = e->GetMinHeight();
        else
            ps.min_h = MAX(ps.min_h, e->GetIntrinsicMinHeight());

        if (e->GetMaxWidth() != SKIN_VALUE_NOT_SPECIFIED)
            ps.max_w = e->GetMaxWidth();
        else
            ps.max_w += e->padding_left + e->padding_right;

        if (e->GetMaxHeight() != SKIN_VALUE_NOT_SPECIFIED)
            ps.max_h = e->GetMaxHeight();
        else
            ps.max_h += e->padding_top + e->padding_bottom;

        // Sanitize result
        ps.pref_w = MAX(ps.pref_w, ps.min_w);
        ps.pref_h = MAX(ps.pref_h, ps.min_h);
    }
    return ps;
}

PreferredSize TBWidget::GetPreferredSize(const SizeConstraints &in_constraints)
{
    SizeConstraints constraints(in_constraints);
    if (m_layout_params)
        constraints = constraints.ConstrainByLayoutParams(*m_layout_params);

    // Returned cached result if valid and the constraints are the same.
    if (m_packed.is_cached_ps_valid)
    {
        if (m_cached_sc == constraints ||
                m_cached_ps.size_dependency == SIZE_DEP_NONE /*||
                    // FIX: These optimizations would probably be good. Keeping
                    //      disabled for now because it needs testing.
                    // If *only* width depend on height, only the height matter
                    (m_cached_ps.size_dependency == SIZE_DEP_WIDTH_DEPEND_ON_HEIGHT &&
                    m_cached_sc.available_h == constraints.available_h) ||
                    // If *only* height depend on width, only the width matter
                    (m_cached_ps.size_dependency == SIZE_DEP_HEIGHT_DEPEND_ON_WIDTH &&
                    m_cached_sc.available_w == constraints.available_w)*/)
        {
            return m_cached_ps;
        }
    }

    // Measure and save to cache
    TB_IF_DEBUG_SETTING(LAYOUT_PS_DEBUGGING, last_measure_time = TBSystem::GetTimeMS());
    m_packed.is_cached_ps_valid = 1;
    m_cached_ps = OnCalculatePreferredSize(constraints);
    m_cached_sc = constraints;

    // Override the calculated ps with any specified layout parameter.
    if (m_layout_params)
    {
#define LP_OVERRIDE(param)	if (m_layout_params->param != LayoutParams::UNSPECIFIED) \
    m_cached_ps.param = m_layout_params->param;
        LP_OVERRIDE(min_w);
        LP_OVERRIDE(min_h);
        LP_OVERRIDE(max_w);
        LP_OVERRIDE(max_h);
        LP_OVERRIDE(pref_w);
        LP_OVERRIDE(pref_h);

        // Sanitize results
        m_cached_ps.max_w = MAX(m_cached_ps.max_w, m_cached_ps.min_w);
        m_cached_ps.max_h = MAX(m_cached_ps.max_h, m_cached_ps.min_h);
        m_cached_ps.pref_w = MAX(m_cached_ps.pref_w, m_cached_ps.min_w);
        m_cached_ps.pref_h = MAX(m_cached_ps.pref_h, m_cached_ps.min_h);
    }
    return m_cached_ps;
}

void TBWidget::SetLayoutParams(const LayoutParams &lp)
{
    if (!m_layout_params)
        m_layout_params = new LayoutParams;
    if (!m_layout_params)
        return;
    *m_layout_params = lp;
    m_packed.is_cached_ps_valid = 0;
    InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);
}

void TBWidget::InvalidateLayout(INVALIDATE_LAYOUT il)
{
    m_packed.is_cached_ps_valid = 0;
    if (GetVisibility() == WIDGET_VISIBILITY_GONE)
        return;
    Invalidate();
    if (il == INVALIDATE_LAYOUT_RECURSIVE && m_parent)
        m_parent->InvalidateLayout(il);
}

void TBWidget::InvokeProcess()
{
    InvokeSkinUpdatesInternal(false);
    InvokeProcessInternal();
}

void TBWidget::InvokeSkinUpdatesInternal(bool force_update)
{
    if (!update_skin_states && !force_update)
        return;
    update_skin_states = false;

    // Check if the skin we get is different from what we expect. That might happen
    // if the skin has some strong override dependant a condition that has changed.
    // If that happens, call OnSkinChanged so the widget can react to that, and
    // invalidate layout to apply new skin properties.
    if (TBSkinElement *skin_elm = GetSkinBgElement())
    {
        if (skin_elm->id != m_skin_bg_expected)
        {
            OnSkinChanged();
            m_skin_bg_expected = skin_elm->id;
            InvalidateLayout(INVALIDATE_LAYOUT_RECURSIVE);
        }
    }

    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
        child->InvokeSkinUpdatesInternal(true);
}

void TBWidget::InvokeProcessInternal()
{
    OnProcess();

    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
        child->InvokeProcessInternal();

    OnProcessAfterChildren();
}

void TBWidget::InvokeProcessStates(bool force_update)
{
    if (!update_widget_states && !force_update)
        return;
    update_widget_states = false;

    OnProcessStates();

    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
        child->InvokeProcessStates(true);
}

float TBWidget::CalculateOpacityInternal(WIDGET_STATE state, TBSkinElement *skin_element) const
{
    float opacity = m_opacity;
    if (skin_element)
        opacity *= skin_element->opacity;
    if (state & WIDGET_STATE_DISABLED)
        opacity *= g_tb_skin->GetDefaultDisabledOpacity();
    return opacity;
}

void TBWidget::InvokePaint(const PaintProps &parent_paint_props)
{
    // Don't paint invisible widgets
    if (m_opacity == 0 || m_rect.IsEmpty() || GetVisibility() != WIDGET_VISIBILITY_VISIBLE)
        return;

    WIDGET_STATE state = GetAutoState();
    TBSkinElement *skin_element = GetSkinBgElement();

    // Multiply current opacity with widget opacity, skin opacity and state opacity.
    float old_opacity = g_renderer->GetOpacity();
    float opacity = old_opacity * CalculateOpacityInternal(state, skin_element);
    if (opacity == 0)
        return;

    // FIX: This does not give the correct result! Must use a new render target!
    g_renderer->SetOpacity(opacity);

    int trns_x = m_rect.x, trns_y = m_rect.y;
    g_renderer->Translate(trns_x, trns_y);

    // Paint background skin
    TBRect local_rect(0, 0, m_rect.w, m_rect.h);
    TBWidgetSkinConditionContext context(this);
    TBSkinElement *used_element = g_tb_skin->PaintSkin(local_rect, skin_element, static_cast<SKIN_STATE>(state), context);
    assert(!!used_element == !!skin_element);

    TB_IF_DEBUG_SETTING(LAYOUT_BOUNDS, g_renderer->DrawRect(local_rect, TBColor(255, 255, 255, 50)));

    // Inherit properties from parent if not specified in the used skin for this widget.
    PaintProps paint_props = parent_paint_props;
    if (used_element && used_element->text_color != 0)
        paint_props.text_color = used_element->text_color;

    // Paint content
    OnPaint(paint_props);

    if (used_element)
        g_renderer->Translate(used_element->content_ofs_x, used_element->content_ofs_y);

    // Paint children
    OnPaintChildren(paint_props);

#ifdef TB_RUNTIME_DEBUG_INFO
    if (TB_DEBUG_SETTING(LAYOUT_PS_DEBUGGING))
    {
        // Layout debug painting. Paint recently layouted widgets with red and
        // recently measured widgets with yellow.
        // Invalidate to keep repainting until we've timed out (so it's removed).
        const double debug_time = 300;
        const double now = TBSystem::GetTimeMS();
        if (now < last_layout_time + debug_time)
        {
            g_renderer->DrawRect(local_rect, TBColor(255, 30, 30, 200));
            Invalidate();
        }
        if (now < last_measure_time + debug_time)
        {
            g_renderer->DrawRect(local_rect.Shrink(1, 1), TBColor(255, 255, 30, 200));
            Invalidate();
        }
    }
#endif // TB_RUNTIME_DEBUG_INFO

    if (used_element)
        g_renderer->Translate(-used_element->content_ofs_x, -used_element->content_ofs_y);

    g_renderer->Translate(-trns_x, -trns_y);
    g_renderer->SetOpacity(old_opacity);
}

bool TBWidget::InvokeEvent(TBWidgetEvent &ev)
{
    ev.target = this;

    // First call the global listener about this event.
    // Who knows, maybe some listener will block the event or cause us
    // to be deleted.
    TBWidgetSafePointer this_widget(this);
    if (TBWidgetListener::InvokeWidgetInvokeEvent(this, ev))
        return true;

    if (!this_widget.Get())
        return true; // We got removed so we actually handled this event.

    if (ev.type == EVENT_TYPE_CHANGED)
    {
        InvalidateSkinStates();
        m_connection.SyncFromWidget(this);
    }

    if (!this_widget.Get())
        return true; // We got removed so we actually handled this event.

    // Always update states after some event types.
    switch (ev.type)
    {
    case EVENT_TYPE_CLICK:
    case EVENT_TYPE_LONG_CLICK:
    case EVENT_TYPE_CHANGED:
    case EVENT_TYPE_KEY_DOWN:
    case EVENT_TYPE_KEY_UP:
        InvalidateStates();
    default:
        break;
    };

    // Call OnEvent on this widgets and travel up through its parents if not handled.
    bool handled = false;
    TBWidget *tmp = this;
    while (tmp && !(handled = tmp->OnEvent(ev)))
        tmp = tmp->GetEventDestination();
    return handled;
}

void TBWidget::StartLongClickTimer(bool touch)
{
    StopLongClickTimer();
    m_long_click_timer = new TBLongClickTimer(this, touch);
}

void TBWidget::StopLongClickTimer()
{
    if (!m_long_click_timer)
        return;
    delete m_long_click_timer;
    m_long_click_timer = nullptr;
}

void TBWidget::InvokePointerDown(int x, int y, int click_count, MODIFIER_KEYS modifierkeys, bool touch, int touchId)
{
    TBWidget* down_widget = GetWidgetAt(x, y, true);
    if (!captured_widget && down_widget && down_widget->needCapturing_)
    {
        SetCapturedWidget(down_widget);
        SetHoveredWidget(captured_widget, touch);
        //captured_button = button;

        // Hide focus when we use the pointer, if it's not on the focused widget.
        if (focused_widget != captured_widget)
            SetAutoFocusState(false);

        // Start long click timer. Only for touch events for now.
        if (touch && captured_widget && captured_widget->GetWantLongClick())
            captured_widget->StartLongClickTimer(touch);

        // Get the closest parent window and bring it to the top
        TBWindow *window = captured_widget ? captured_widget->GetParentWindow() : nullptr;
        if (window)
            window->Activate();
    }
    if (captured_widget)
    {
        // Check if there's any started scroller that should be stopped.
        TBWidget *tmp = captured_widget;
        while (tmp)
        {
            if (tmp->m_scroller && tmp->m_scroller->IsStarted())
            {
                // When we touch down to stop a scroller, we don't
                // want the touch to end up causing a click.
                cancel_click = true;
                tmp->m_scroller->Stop();
                break;
            }
            tmp = tmp->GetParent();
        }

        // Focus the captured widget or the closest
        // focusable parent if it isn't focusable.
        TBWidget *focus_target = captured_widget;
        while (focus_target)
        {
            if (focus_target->SetFocus(WIDGET_FOCUS_REASON_POINTER))
                break;
            focus_target = focus_target->m_parent;
        }
    }
    //save x and y to restore it later
    int ox = x;
    int oy = y;
    //check only for captured_widget
    if (captured_widget)
    {
        captured_widget->SetTouchId(touchId);
        //converts x, y
        captured_widget->ConvertFromRoot(x, y);
        pointer_move_widget_x = pointer_down_widget_x = x;
        pointer_move_widget_y = pointer_down_widget_y = y;
        TBWidgetEvent ev(EVENT_TYPE_POINTER_DOWN, x, y, touch, modifierkeys);
        ev.count = click_count;
        captured_widget->InvokeEvent(ev);
    }
    //restore x and y coords, to use with down_widget
    x = ox;
    y = oy;
    //if down_widget is captured and it's not a captured_widget 
    //then send an event, otherwise don't send it because POINTER_DOWN event will be sent twice
    if (down_widget && down_widget != captured_widget)
    {
        //the same things that's done with captured_widget
        down_widget->Invalidate();
        down_widget->InvalidateSkinStates();
        down_widget->OnCaptureChanged(true);
        down_widget->SetTouchId(touchId);
        //convert x, y
        down_widget->ConvertFromRoot(x, y);
        TBWidgetEvent ev(EVENT_TYPE_POINTER_DOWN, x, y, touch, modifierkeys);
        ev.count = click_count;
        down_widget->InvokeEvent(ev);
    }
}

void TBWidget::InvokePointerUp(int x, int y, MODIFIER_KEYS modifierkeys, bool touch, int touchId)
{
    //get down_widget before making handling captured_widget event to make sure that down_widget won't be changed
    TBWidget* down_widget = GetWidgetAt(x, y, true);
    //save x and y to restore it later
    int ox = x;
    int oy = y;
    //save old_capture for later check, because captured_widget can be nullptr after releasing capture
    TBWidget *old_capture = captured_widget;
    if (captured_widget && captured_widget->touchId_ == touchId)
    {
        captured_widget->ConvertFromRoot(x, y);
        TBWidgetEvent ev_up(EVENT_TYPE_POINTER_UP, x, y, touch, modifierkeys);
        TBWidgetEvent ev_click(EVENT_TYPE_CLICK, x, y, touch, modifierkeys);
        captured_widget->OnCaptureChanged(false);
        captured_widget->InvokeEvent(ev_up);
        if (!cancel_click && captured_widget->GetHitStatus(x, y))
        {
            captured_widget->InvokeEvent(ev_click);
        }
        captured_widget->ReleaseCapture();
    }
    //restore x and y coords, to use with down_widget
    x = ox;
    y = oy;
    //make sure that down_widget is not captured_widget to don't sent event twice
    if (down_widget && down_widget->touchId_ == touchId && old_capture != down_widget)
    {
        down_widget->ConvertFromRoot(x, y);
        TBWidgetEvent ev_up(EVENT_TYPE_POINTER_UP, x, y, touch, modifierkeys);
        TBWidgetEvent ev_click(EVENT_TYPE_CLICK, x, y, touch, modifierkeys);
        down_widget->OnCaptureChanged(false);
        down_widget->InvokeEvent(ev_up);
        if (!cancel_click && down_widget->GetHitStatus(x, y))
        {
            down_widget->InvokeEvent(ev_click);
        }
        //ReleaseCapture
        down_widget->Invalidate();
        down_widget->InvalidateSkinStates();
    }
}

void TBWidget::InvokeRightPointerDown(int x, int y, int click_count, MODIFIER_KEYS modifierkeys)
{
    // note we're not capturing the widget as with normal pointer down
    TBWidget* widget = GetWidgetAt(x, y, true);

    if (!widget)
        return;

    TBWidgetEvent ev(EVENT_TYPE_RIGHT_POINTER_DOWN, x, y, false, modifierkeys);
    ev.count = click_count;
    widget->InvokeEvent(ev);
}

void TBWidget::InvokeRightPointerUp(int x, int y, MODIFIER_KEYS modifierkeys)
{
    // note we're not capturing the widget as with normal pointer down
    TBWidget* widget = GetWidgetAt(x, y, true);

    if (!widget)
        return;

    TBWidgetEvent ev(EVENT_TYPE_RIGHT_POINTER_UP, x, y, false, modifierkeys);
    ev.target = widget;
    widget->InvokeEvent(ev);

}


void TBWidget::MaybeInvokeLongClickOrContextMenu(bool touch)
{
    StopLongClickTimer();
    if (captured_widget == this &&
            !cancel_click &&
            captured_widget->GetHitStatus(pointer_move_widget_x, pointer_move_widget_y))
    {
        // Invoke long click
        TBWidgetEvent ev_long_click(EVENT_TYPE_LONG_CLICK, pointer_move_widget_x, pointer_move_widget_y, touch, TB_MODIFIER_NONE);
        bool handled = captured_widget->InvokeEvent(ev_long_click);
        if (!handled)
        {
            // Long click not handled so invoke a context menu event instead
            TBWidgetEvent ev_context_menu(EVENT_TYPE_CONTEXT_MENU, pointer_move_widget_x, pointer_move_widget_y, touch, TB_MODIFIER_NONE);
            handled = captured_widget->InvokeEvent(ev_context_menu);
        }
        // If any event was handled, suppress click when releasing pointer.
        if (handled)
            cancel_click = true;
    }
}

void TBWidget::InvokePointerMove(int x, int y, MODIFIER_KEYS modifierkeys, bool touch, int touchId)
{
    TBWidget* move = GetWidgetByTouchId(touchId);
    if (move && move->IsCaptured())
    {
        int cx = x;
        int cy = y;
        move->ConvertFromRoot(cx, cy);
        if (!move->GetHitStatus(cx, cy))
        {
            move->Invalidate();
            move->InvalidateSkinStates();
            move->OnCaptureChanged(false);
            TBWidgetEvent ev_up(EVENT_TYPE_POINTER_UP, cx, cy, touch, TB_MODIFIER_NONE);
            move->InvokeEvent(ev_up);
        }
    }
    SetHoveredWidget(GetWidgetAt(x, y, true), touch);
    TBWidget *target = captured_widget ? captured_widget : hovered_widget;
    if (target)
    {
        target->ConvertFromRoot(x, y);
        pointer_move_widget_x = x;
        pointer_move_widget_y = y;

        TBWidgetEvent ev(EVENT_TYPE_POINTER_MOVE, x, y, touch, modifierkeys);
        if (target->InvokeEvent(ev))
            return;

        // The move event was not handled, so handle panning of scrollable widgets.
        HandlePanningOnMove(x, y);
    }
}

void TBWidget::HandlePanningOnMove(int x, int y)
{
    if (!captured_widget)
        return;

    // Check pointer movement
    const int dx = pointer_down_widget_x - x;
    const int dy = pointer_down_widget_y - y;
    const int threshold = TBSystem::GetPanThreshold();
    const bool maybe_start_panning_x = ABS(dx) >= threshold;
    const bool maybe_start_panning_y = ABS(dy) >= threshold;

    // Do panning, or attempt starting panning (we don't know if any widget is scrollable yet)
    if (captured_widget->m_packed.is_panning || maybe_start_panning_x || maybe_start_panning_y)
    {
        // The threshold is met for not invoking any long click
        captured_widget->StopLongClickTimer();

        int start_compensation_x = 0, start_compensation_y = 0;
        if (!captured_widget->m_packed.is_panning)
        {
            // When we start panning, deduct the extra distance caused by the
            // start threshold from the delta so we don't start with a sudden jump.
            int extra = threshold - 1;
            if (maybe_start_panning_x)
                start_compensation_x = dx < 0 ? extra : -extra;
            if (maybe_start_panning_y)
                start_compensation_y = dy < 0 ? extra : -extra;
        }

        // Get any active scroller and feed it with pan actions.
        TBScroller *scroller = captured_widget->GetReadyScroller(dx != 0, dy != 0);
        if (!scroller)
            return;

        int old_translation_x = 0, old_translation_y = 0;
        captured_widget->GetScrollRoot()->GetChildTranslation(old_translation_x, old_translation_y);

        if (scroller->OnPan(dx + start_compensation_x, dy + start_compensation_y))
        {
            // Scroll delta changed, so we are now panning!
            captured_widget->m_packed.is_panning = true;
            cancel_click = true;

            // If the captured widget (or its scroll root) has panned, we have to compensate the
            // pointer down coordinates so we won't accumulate the difference the following pan.
            int new_translation_x = 0, new_translation_y = 0;
            captured_widget->GetScrollRoot()->GetChildTranslation(new_translation_x, new_translation_y);
            pointer_down_widget_x += new_translation_x - old_translation_x + start_compensation_x;
            pointer_down_widget_y += new_translation_y - old_translation_y + start_compensation_y;
        }
    }
}

void TBWidget::InvokeWheel(int x, int y, int delta_x, int delta_y, MODIFIER_KEYS modifierkeys)
{
    SetHoveredWidget(GetWidgetAt(x, y, true), true);
    TBWidget *target = captured_widget ? captured_widget : hovered_widget;
    if (target)
    {
        target->ConvertFromRoot(x, y);
        pointer_move_widget_x = x;
        pointer_move_widget_y = y;
        TBWidgetEvent ev(EVENT_TYPE_WHEEL, x, y, true, modifierkeys);
        ev.delta_x = delta_x;
        ev.delta_y = delta_y;
        target->InvokeEvent(ev);
    }
}

bool TBWidget::InvokeKey(int key, SPECIAL_KEY special_key, MODIFIER_KEYS modifierkeys, bool down)
{
    bool handled = false;
    if (focused_widget)
    {
        // ATOMIC: This may have some side effects for shortcuts we don't want?
        if (focused_widget->GetDisabled())
            return false;

        // Emulate a click on the focused widget when pressing space or enter
        if (!modifierkeys && focused_widget->GetClickByKey() &&
                !focused_widget->GetDisabled() &&
                !focused_widget->GetIsDying() &&
                (special_key == TB_KEY_ENTER || key == ' '))
        {
            // Set the pressed state while the key is down, if it
            // didn't already have the pressed state.
            static bool check_pressed_state = true;
            static bool had_pressed_state = false;
            if (down && check_pressed_state)
            {
                had_pressed_state = focused_widget->GetState(WIDGET_STATE_PRESSED);
                check_pressed_state = false;
            }
            if (!down)
                check_pressed_state = true;

            if (!had_pressed_state)
            {
                focused_widget->SetState(WIDGET_STATE_PRESSED, down);
                focused_widget->m_packed.has_key_pressed_state = down;
            }

            // Invoke the click event
            if (!down)
            {
                TBWidgetEvent ev(EVENT_TYPE_CLICK, m_rect.w / 2, m_rect.h / 2, true);
                focused_widget->InvokeEvent(ev);
            }
            handled = true;
        }
        else
        {
            // Invoke the key event on the focused widget
            TBWidgetEvent ev(down ? EVENT_TYPE_KEY_DOWN : EVENT_TYPE_KEY_UP);
            ev.key = key;
            ev.special_key = special_key;
            ev.modifierkeys = modifierkeys;
            handled = focused_widget->InvokeEvent(ev);
        }
    }

    // Move focus between widgets
    if (down && !handled && special_key == TB_KEY_TAB)
    {
        handled = MoveFocus(!(modifierkeys & TB_SHIFT));

        // Show the focus when we move it by keyboard
        if (handled)
            SetAutoFocusState(true);
    }
    return handled;
}

void TBWidget::ReleaseCapture()
{
    if (this == captured_widget)
        SetCapturedWidget(nullptr);
}

void TBWidget::ConvertToRoot(int &x, int &y) const
{
    const TBWidget *tmp = this;
    while (tmp->m_parent)
    {
        x += tmp->m_rect.x;
        y += tmp->m_rect.y;
        tmp = tmp->m_parent;

        if (tmp)
        {
            int child_translation_x, child_translation_y;
            tmp->GetChildTranslation(child_translation_x, child_translation_y);
            x += child_translation_x;
            y += child_translation_y;
        }
    }
}

void TBWidget::ConvertFromRoot(int &x, int &y) const
{
    const TBWidget *tmp = this;
    while (tmp->m_parent)
    {
        x -= tmp->m_rect.x;
        y -= tmp->m_rect.y;
        tmp = tmp->m_parent;

        if (tmp)
        {
            int child_translation_x, child_translation_y;
            tmp->GetChildTranslation(child_translation_x, child_translation_y);
            x -= child_translation_x;
            y -= child_translation_y;
        }
    }
}

// static
void TBWidget::SetHoveredWidget(TBWidget *widget, bool touch)
{
    if (TBWidget::hovered_widget == widget)
        return;
    if (widget && widget->GetState(WIDGET_STATE_DISABLED))
        return;

    // We may apply hover state automatically so the widget might need to be updated.
    if (TBWidget::hovered_widget)
    {
        TBWidget::hovered_widget->Invalidate();
        TBWidget::hovered_widget->InvalidateSkinStates();
    }

    TBWidget::hovered_widget = widget;

    if (TBWidget::hovered_widget)
    {
        TBWidget::hovered_widget->Invalidate();
        TBWidget::hovered_widget->InvalidateSkinStates();

        // Cursor based movement should set hover state automatically, but touch
        // events should not (since touch doesn't really move unless pressed).
        TBWidget::hovered_widget->m_packed.no_automatic_hover_state = touch;
    }
}

// static
void TBWidget::SetCapturedWidget(TBWidget *widget)
{
    if (TBWidget::captured_widget == widget)
        return;
    if (widget && widget->GetState(WIDGET_STATE_DISABLED))
        return;

    if (TBWidget::captured_widget)
    {
        // Stop panning when capture change (most likely changing to nullptr because of InvokePointerUp)
        // Notify any active scroller so it may begin scrolling.
        if (TBScroller *scroller = TBWidget::captured_widget->FindStartedScroller())
        {
            if (TBWidget::captured_widget->m_packed.is_panning)
                scroller->OnPanReleased();
            else
                scroller->Stop();
        }
        TBWidget::captured_widget->m_packed.is_panning = false;

        // We apply pressed state automatically so the widget might need to be updated.
        TBWidget::captured_widget->Invalidate();
        TBWidget::captured_widget->InvalidateSkinStates();

        TBWidget::captured_widget->StopLongClickTimer();
    }
    cancel_click = false;

    TBWidget *old_capture = TBWidget::captured_widget;

    TBWidget::captured_widget = widget;

    if (old_capture)
        old_capture->OnCaptureChanged(false);

    if (TBWidget::captured_widget)
    {
        TBWidget::captured_widget->Invalidate();
        TBWidget::captured_widget->InvalidateSkinStates();
        TBWidget::captured_widget->OnCaptureChanged(true);
    }
}

bool TBWidget::SetFontDescription(const TBFontDescription &font_desc)
{
    if (m_font_desc == font_desc)
        return true;

    // Set the font description only if we have a matching font, or succeed creating one.
    if (g_font_manager->HasFontFace(font_desc))
        m_font_desc = font_desc;
    else if (g_font_manager->CreateFontFace(font_desc))
        m_font_desc = font_desc;
    else
        return false;

    InvokeFontChanged();
    return true;
}

void TBWidget::InvokeFontChanged()
{
    OnFontChanged();

    // Recurse to children that inherit the font
    for (TBWidget *child = GetFirstChild(); child; child = child->GetNext())
        if (child->m_font_desc.GetFontFaceID() == 0)
            child->InvokeFontChanged();
}

TBFontDescription TBWidget::GetCalculatedFontDescription() const
{
    const TBWidget *tmp = this;
    while (tmp)
    {
        if (tmp->m_font_desc.GetFontFaceID() != 0)
            return tmp->m_font_desc;
        tmp = tmp->m_parent;
    }
    return g_font_manager->GetDefaultFontDescription();
}

TBFontFace *TBWidget::GetFont() const
{
    return g_font_manager->GetFontFace(GetCalculatedFontDescription());
}

}; // namespace tb