GUIVerticalScrollbarInternalController.cpp

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#include <tdme/gui/nodes/GUIVerticalScrollbarInternalController.h>
 
#include <tdme/tdme.h>
#include <tdme/gui/events/GUIMouseEvent.h>
#include <tdme/gui/nodes/GUILayoutNode.h>
#include <tdme/gui/nodes/GUINode.h>
#include <tdme/gui/nodes/GUINode_Border.h>
#include <tdme/gui/nodes/GUINode_ComputedConstraints.h>
#include <tdme/gui/nodes/GUIParentNode.h>
#include <tdme/gui/nodes/GUIScreenNode.h>
#include <tdme/gui/GUI.h>
 
using tdme::gui::nodes::GUIVerticalScrollbarInternalController;
 
using tdme::gui::events::GUIMouseEvent;
using tdme::gui::nodes::GUILayoutNode;
using tdme::gui::nodes::GUINode;
using tdme::gui::nodes::GUINode_Border;
using tdme::gui::nodes::GUINode_ComputedConstraints;
using tdme::gui::nodes::GUIParentNode;
using tdme::gui::nodes::GUIScreenNode;
using tdme::gui::nodes::GUIVerticalScrollbarInternalController_State;
using tdme::gui::GUI;
 
GUIVerticalScrollbarInternalController::GUIVerticalScrollbarInternalController(GUINode* node)
    : GUINodeController(node)
{
    this->contentNode = required_dynamic_cast<GUILayoutNode*>(node->getScreenNode()->getNodeById(node->getParentControllerNode()->id + "_inner"));
    state = STATE_NONE;
    mouseYOffset = -1;
    contentHeight = 0;
}
 
bool GUIVerticalScrollbarInternalController::isDisabled()
{
    return false;
}
 
void GUIVerticalScrollbarInternalController::setDisabled(bool disabled)
{
}
 
void GUIVerticalScrollbarInternalController::initialize()
{
}
 
void GUIVerticalScrollbarInternalController::dispose()
{
}
 
void GUIVerticalScrollbarInternalController::postLayout()
{
    contentHeight = contentNode->getContentHeight();
}
 
GUIVerticalScrollbarInternalController::State GUIVerticalScrollbarInternalController::getState()
{
    return state;
}
 
float GUIVerticalScrollbarInternalController::getBarHeight()
{
    float elementHeight = contentNode->computedConstraints.height;
    auto barHeightRelative = (elementHeight / contentHeight);
    if (barHeightRelative > 1.0f) barHeightRelative = 1.0f;
    float barHeight = (node->computedConstraints.height - node->border.top - node->border.bottom) * barHeightRelative;
    if (barHeight < 20.0f) barHeight = 20.0f;
    return barHeight;
}
 
float GUIVerticalScrollbarInternalController::getBarTop()
{
    float elementHeight = contentNode->computedConstraints.height;
    auto scrollableHeight = contentHeight - elementHeight;
    auto childrenRenderOffsetY = contentNode->getChildrenRenderOffsetY();
    if (scrollableHeight > 0.0f) {
        return node->computedConstraints.top + node->computedConstraints.alignmentTop + node->border.top + (childrenRenderOffsetY * ((node->computedConstraints.height - getBarHeight()) / scrollableHeight));
    } else {
        return node->computedConstraints.top + node->computedConstraints.alignmentTop + node->border.top;
    }
}
 
void GUIVerticalScrollbarInternalController::setDraggedY(float draggedY)
{
    float elementHeight = contentNode->computedConstraints.height;
    auto scrollableHeight = contentHeight - elementHeight;
    if (scrollableHeight <= 0.0f) return;
 
    auto childrenRenderOffsetY = contentNode->getChildrenRenderOffsetY() + (draggedY * (scrollableHeight / (node->computedConstraints.height - getBarHeight())));
    if (childrenRenderOffsetY < 0) childrenRenderOffsetY = 0;
    if (childrenRenderOffsetY > scrollableHeight) childrenRenderOffsetY = scrollableHeight;
 
    contentNode->setChildrenRenderOffsetY(childrenRenderOffsetY);
}
 
void GUIVerticalScrollbarInternalController::handleMouseEvent(GUINode* node, GUIMouseEvent* event)
{
    if (event->getType() == GUIMouseEvent::MOUSEEVENT_MOVED) {
        if (this->node->isEventBelongingToNode(event) == true) {
            state = STATE_MOUSEOVER;
            this->node->getScreenNode()->getGUI()->addMouseOutCandidateNode(this->node);
        } else {
            state = STATE_NONE;
        }
        event->setProcessed(true);
    } else
    if (this->node == node && event->getButton() == MOUSE_BUTTON_LEFT) {
        if (node->isEventBelongingToNode(event) == true && event->getType() == GUIMouseEvent::MOUSEEVENT_PRESSED) {
            auto barOffsetY = node->computeParentChildrenRenderOffsetYTotal();
            auto barTop = getBarTop();
            auto barHeight = getBarHeight();
            if (event->getY() + barOffsetY < barTop) {
                float elementHeight = contentNode->computedConstraints.height;
                auto scrollableHeight = contentHeight - elementHeight;
                setDraggedY(-elementHeight * ((node->computedConstraints.height - barHeight) / scrollableHeight));
            } else
            if (event->getY() + barOffsetY > barTop + barHeight) {
                float elementHeight = contentNode->computedConstraints.height;
                auto scrollableHeight = contentHeight - elementHeight;
                setDraggedY(+elementHeight * ((node->computedConstraints.height - barHeight) / scrollableHeight));
            } else
            if (event->getY() + barOffsetY >= barTop && event->getY() + barOffsetY < barTop + barHeight) {
                mouseYOffset = static_cast<int>((event->getY() - barTop));
                state = STATE_DRAGGING;
            }
            event->setProcessed(true);
        } else
        if (state == STATE_DRAGGING && event->getType() == GUIMouseEvent::MOUSEEVENT_RELEASED) {
            mouseYOffset = -1;
            state = STATE_NONE;
            event->setProcessed(true);
        } else
        if (state == STATE_DRAGGING && event->getType() == GUIMouseEvent::MOUSEEVENT_DRAGGED) {
            auto barTop = getBarTop();
            auto draggedY = event->getY() - barTop - mouseYOffset;
            setDraggedY(draggedY);
            event->setProcessed(true);
        }
    }
}
 
void GUIVerticalScrollbarInternalController::handleKeyboardEvent(GUIKeyboardEvent* event)
{
}
 
void GUIVerticalScrollbarInternalController::tick()
{
}
 
void GUIVerticalScrollbarInternalController::onFocusGained()
{
}
 
void GUIVerticalScrollbarInternalController::onFocusLost()
{
}
 
bool GUIVerticalScrollbarInternalController::hasValue()
{
    return false;
}
 
const MutableString& GUIVerticalScrollbarInternalController::getValue()
{
    return value;
}
 
void GUIVerticalScrollbarInternalController::setValue(const MutableString& value)
{
}
 
void GUIVerticalScrollbarInternalController::onSubTreeChange()
{
}