AtomicGameEngine/Source/ThirdParty/TurboBadger/tb_window.cpp

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

#include "tb_window.h"
#include <assert.h>

namespace tb {

// == TBWindow ==========================================================================

TBWindow::TBWindow()
    : m_settings(WINDOW_SETTINGS_DEFAULT)
{
    SetSkinBg(TBIDC("TBWindow"), WIDGET_INVOKE_INFO_NO_CALLBACKS);
    AddChild(&m_mover);
    AddChild(&m_resizer);
    m_mover.SetSkinBg(TBIDC("TBWindow.mover"));
    m_mover.AddChild(&m_textfield);
    m_textfield.SetIgnoreInput(true);
    m_mover.AddChild(&m_close_button);
    m_close_button.SetSkinBg(TBIDC("TBWindow.close"));
    m_close_button.SetIsFocusable(false);
    m_close_button.SetID(TBIDC("TBWindow.close"));
    SetIsGroupRoot(true);
}

TBWindow::~TBWindow()
{
    if (m_resizer.GetParent())		RemoveChild(&m_resizer);
    if (m_mover.GetParent())		RemoveChild(&m_mover);
    if (m_close_button.GetParent())	m_mover.RemoveChild(&m_close_button);
    m_mover.RemoveChild(&m_textfield);
}

TBRect TBWindow::GetResizeToFitContentRect(RESIZE_FIT fit)
{
    PreferredSize ps = GetPreferredSize();
    int new_w = ps.pref_w;
    int new_h = ps.pref_h;
    if (fit == RESIZE_FIT_MINIMAL)
    {
        new_w = ps.min_w;
        new_h = ps.min_h;
    }
    else if (fit == RESIZE_FIT_CURRENT_OR_NEEDED)
    {
        new_w = CLAMP(GetRect().w, ps.min_w, ps.max_w);
        new_h = CLAMP(GetRect().h, ps.min_h, ps.max_h);
    }
    if (GetParent())
    {
        new_w = MIN(new_w, GetParent()->GetRect().w);
        new_h = MIN(new_h, GetParent()->GetRect().h);
    }
    return TBRect(GetRect().x, GetRect().y, new_w, new_h);
}

void TBWindow::ResizeToFitContent(RESIZE_FIT fit)
{
    SetRect(GetResizeToFitContentRect(fit));
}

void TBWindow::Close()
{
    Die();
}

bool TBWindow::IsActive() const
{
    return GetState(WIDGET_STATE_SELECTED);
}

TBWindow *TBWindow::GetTopMostOtherWindow(bool only_activable_windows)
{
    TBWindow *other_window = nullptr;
    TBWidget *sibling = GetParent()->GetLastChild();
    while (sibling && !other_window)
    {
        if (sibling != this)
            other_window = TBSafeCast<TBWindow>(sibling);

        if (only_activable_windows && other_window && !(other_window->m_settings & WINDOW_SETTINGS_CAN_ACTIVATE))
            other_window = nullptr;

        sibling = sibling->GetPrev();
    }
    return other_window;
}

void TBWindow::Activate()
{
    if (!GetParent() || !(m_settings & WINDOW_SETTINGS_CAN_ACTIVATE))
        return;
    if (IsActive())
    {
        // Already active, but we may still have lost focus,
        // so ensure it comes back to us.
        EnsureFocus();
        return;
    }

    // Deactivate currently active window
    TBWindow *active_window = GetTopMostOtherWindow(true);
    if (active_window)
        active_window->DeActivate();

    // Activate this window

    SetZ(WIDGET_Z_TOP);
    SetWindowActiveState(true);
    EnsureFocus();
}

bool TBWindow::EnsureFocus()
{
    // If we already have focus, we're done.
    if (focused_widget && IsAncestorOf(focused_widget))
        return true;

    // Focus last focused widget (if we have one)
    bool success = false;
    if (m_last_focus.Get())
        success = m_last_focus.Get()->SetFocus(WIDGET_FOCUS_REASON_UNKNOWN);
    // We didn't have one or failed, so try focus any child.
    if (!success)
        success = SetFocusRecursive(WIDGET_FOCUS_REASON_UNKNOWN);
    return success;
}

void TBWindow::DeActivate()
{
    if (!IsActive())
        return;
    SetWindowActiveState(false);
}

void TBWindow::SetWindowActiveState(bool active)
{
    SetState(WIDGET_STATE_SELECTED, active);
    m_mover.SetState(WIDGET_STATE_SELECTED, active);
}

void TBWindow::SetSettings(WINDOW_SETTINGS settings)
{
    if (settings == m_settings)
        return;
    m_settings = settings;

    if (settings & WINDOW_SETTINGS_TITLEBAR)
    {
        if (!m_mover.GetParent())
            AddChild(&m_mover);
    }
    else if (!(settings & WINDOW_SETTINGS_TITLEBAR))
    {
        if (m_mover.GetParent())
            RemoveChild(&m_mover);
    }
    if (settings & WINDOW_SETTINGS_RESIZABLE)
    {
        if (!m_resizer.GetParent())
            AddChild(&m_resizer);
    }
    else if (!(settings & WINDOW_SETTINGS_RESIZABLE))
    {
        if (m_resizer.GetParent())
            RemoveChild(&m_resizer);
    }
    if (settings & WINDOW_SETTINGS_CLOSE_BUTTON)
    {
        if (!m_close_button.GetParent())
            m_mover.AddChild(&m_close_button);
    }
    else if (!(settings & WINDOW_SETTINGS_CLOSE_BUTTON))
    {
        if (m_close_button.GetParent())
            m_mover.RemoveChild(&m_close_button);
    }

    // FIX: invalidate layout / resize window!
    Invalidate();
}

int TBWindow::GetTitleHeight()
{
    if (m_settings & WINDOW_SETTINGS_TITLEBAR)
        return m_mover.GetPreferredSize().pref_h;
    return 0;
}

TBRect TBWindow::GetPaddingRect()
{
    TBRect padding_rect = TBWidget::GetPaddingRect();
    int title_height = GetTitleHeight();
    padding_rect.y += title_height;
    padding_rect.h -= title_height;
    return padding_rect;
}

PreferredSize TBWindow::OnCalculatePreferredSize(const SizeConstraints &constraints)
{
    PreferredSize ps = OnCalculatePreferredContentSize(constraints);

    // Add window skin padding
    if (TBSkinElement *e = GetSkinBgElement())
    {
        ps.min_w += e->padding_left + e->padding_right;
        ps.pref_w += e->padding_left + e->padding_right;
        ps.min_h += e->padding_top + e->padding_bottom;
        ps.pref_h += e->padding_top + e->padding_bottom;
    }
    // Add window title bar height
    int title_height = GetTitleHeight();
    ps.min_h += title_height;
    ps.pref_h += title_height;
    return ps;
}

bool TBWindow::OnEvent(const TBWidgetEvent &ev)
{
    if (ev.target == &m_close_button)
    {
        if (ev.type == EVENT_TYPE_CLICK)
            Close();
        return true;
    }
    return TBWidget::OnEvent(ev);
}

void TBWindow::OnAdded()
{
    // If we was added last, call Activate to update status etc.
    if (GetParent()->GetLastChild() == this)
        Activate();
}

void TBWindow::OnRemove()
{
    DeActivate();

    // Active the top most other window
    if (TBWindow *active_window = GetTopMostOtherWindow(true))
        active_window->Activate();
}

void TBWindow::OnChildAdded(TBWidget *child)
{
    m_resizer.SetZ(WIDGET_Z_TOP);
}

void TBWindow::OnResized(int old_w, int old_h)
{
    // Apply gravity on children
    TBWidget::OnResized(old_w, old_h);
    // Manually move our own decoration children
    // FIX: Put a layout in the TBMover so we can add things there nicely.
    int title_height = GetTitleHeight();
    m_mover.SetRect(TBRect(0, 0, GetRect().w, title_height));
    PreferredSize ps = m_resizer.GetPreferredSize();
    m_resizer.SetRect(TBRect(GetRect().w - ps.pref_w, GetRect().h - ps.pref_h, ps.pref_w, ps.pref_h));
    TBRect mover_rect = m_mover.GetPaddingRect();
    int button_size = mover_rect.h;
    m_close_button.SetRect(TBRect(mover_rect.x + mover_rect.w - button_size, mover_rect.y, button_size, button_size));
    if (m_settings & WINDOW_SETTINGS_CLOSE_BUTTON)
        mover_rect.w -= button_size;
    m_textfield.SetRect(mover_rect);
}

}; // namespace tb