/*
* This source file is part of RmlUi, the HTML/CSS Interface Middleware
*
* For the latest information, see http://github.com/mikke89/RmlUi
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
* Copyright (c) 2019 The RmlUi Team, and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "ElementHandle.h"
#include "../../Include/RmlUi/Core/ComputedValues.h"
#include "../../Include/RmlUi/Core/ElementDocument.h"
#include "../../Include/RmlUi/Core/ElementUtilities.h"
#include "../../Include/RmlUi/Core/Property.h"
#include "../../Include/RmlUi/Core/Event.h"
namespace Rml {
ElementHandle::ElementHandle(const String& tag) : Element(tag), drag_start(0, 0)
{
// Make sure we can be dragged!
SetProperty(PropertyId::Drag, Property(Style::Drag::Drag));
move_target = nullptr;
size_target = nullptr;
initialised = false;
}
ElementHandle::~ElementHandle()
{
}
void ElementHandle::OnAttributeChange(const ElementAttributes& changed_attributes)
{
Element::OnAttributeChange(changed_attributes);
// Reset initialised state if the move or size targets have changed.
if (changed_attributes.find("move_target") != changed_attributes.end() ||
changed_attributes.find("size_target") != changed_attributes.end())
{
initialised = false;
move_target = nullptr;
size_target = nullptr;
}
}
void ElementHandle::ProcessDefaultAction(Event& event)
{
Element::ProcessDefaultAction(event);
if (event.GetTargetElement() == this)
{
// Lazy initialisation.
if (!initialised && GetOwnerDocument())
{
String move_target_name = GetAttribute("move_target", "");
if (!move_target_name.empty())
move_target = GetElementById(move_target_name);
String size_target_name = GetAttribute("size_target", "");
if (!size_target_name.empty())
size_target = GetElementById(size_target_name);
initialised = true;
}
auto GetSize = [](const Box& box, const ComputedValues& computed) {
return box.GetSize((computed.box_sizing() == Style::BoxSizing::BorderBox) ? Box::BORDER : Box::CONTENT);
};
// Set any auto margins to their current value, since auto-margins may affect the size and position of an element.
auto SetDefiniteMargins = [](Element* element, const ComputedValues& computed) {
auto SetDefiniteMargin = [](Element* element, PropertyId margin_id, Box::Edge edge) {
element->SetProperty(margin_id, Property(Math::RoundFloat(element->GetBox().GetEdge(Box::MARGIN, edge)), Property::PX));
};
using Style::Margin;
if (computed.margin_top().type == Margin::Auto)
SetDefiniteMargin(element, PropertyId::MarginTop, Box::TOP);
if (computed.margin_right().type == Margin::Auto)
SetDefiniteMargin(element, PropertyId::MarginRight, Box::RIGHT);
if (computed.margin_bottom().type == Margin::Auto)
SetDefiniteMargin(element, PropertyId::MarginBottom, Box::BOTTOM);
if (computed.margin_left().type == Margin::Auto)
SetDefiniteMargin(element, PropertyId::MarginLeft, Box::LEFT);
};
if (event == EventId::Dragstart)
{
// Store the drag starting position
drag_start = event.GetUnprojectedMouseScreenPos();
// Store current element position and size
if (move_target)
{
using namespace Style;
const Box& box = move_target->GetBox();
const auto& computed = move_target->GetComputedValues();
// Store the initial margin edge position, since top/left properties determine the margin position.
move_original_position.x = move_target->GetOffsetLeft() - box.GetEdge(Box::MARGIN, Box::LEFT);
move_original_position.y = move_target->GetOffsetTop() - box.GetEdge(Box::MARGIN, Box::TOP);
// Check if we have auto-size together with definite right/bottom; if so, the size needs to be fixed to the current size.
if (computed.width().type == Width::Auto && computed.right().type != Right::Auto)
move_target->SetProperty(PropertyId::Width, Property(Math::RoundFloat(GetSize(box, computed).x), Property::PX));
if (computed.height().type == Height::Auto && computed.bottom().type != Bottom::Auto)
move_target->SetProperty(PropertyId::Height, Property(Math::RoundFloat(GetSize(box, computed).y), Property::PX));
SetDefiniteMargins(move_target, computed);
}
if (size_target)
{
using namespace Style;
const Box& box = size_target->GetBox();
const auto& computed = size_target->GetComputedValues();
size_original_size = GetSize(box, computed);
SetDefiniteMargins(size_target, computed);
}
}
else if (event == EventId::Drag)
{
const Vector2f delta = event.GetUnprojectedMouseScreenPos() - drag_start;
if (move_target)
{
const Vector2f new_position = (move_original_position + delta).Round();
move_target->SetProperty(PropertyId::Left, Property(new_position.x, Property::PX));
move_target->SetProperty(PropertyId::Top, Property(new_position.y, Property::PX));
}
if (size_target)
{
const Vector2f new_size = Math::Max((size_original_size + delta).Round(), Vector2f(0.f));
size_target->SetProperty(PropertyId::Width, Property(new_size.x, Property::PX));
size_target->SetProperty(PropertyId::Height, Property(new_size.y, Property::PX));
}
Dictionary parameters;
parameters["handle_x"] = delta.x;
parameters["handle_y"] = delta.y;
DispatchEvent(EventId::Handledrag, parameters);
}
}
}
} // namespace Rml