MRRenderClickableRect.h

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#pragma once
 
#include "MRMesh/MRIRenderObject.h"
#include "MRViewer/exports.h"
 
#include "MRViewer/MRImGui.h"
 
namespace MR
{
 
// This is a helper base class for writing `BasicUiRenderTask`s that let you click a rectangle in the scene.
// Note, this task relies on preserving state between the frames.
class MRVIEWER_CLASS BasicClickableRectUiRenderTask : public BasicUiRenderTask
{
public:
    BasicClickableRectUiRenderTask() = default;
 
    // Don't assign the memebers (except the base), because we want to preserve the state across frames.
    BasicClickableRectUiRenderTask( const BasicClickableRectUiRenderTask& other ) : BasicUiRenderTask( other ) {}
    BasicClickableRectUiRenderTask& operator=( const BasicClickableRectUiRenderTask& other ) { BasicUiRenderTask::operator=( other ); return *this; }
 
    virtual ~BasicClickableRectUiRenderTask() = default;
 
    // This is called when the click happens.
    virtual void onClick() = 0;
 
    // This is what ultimately calls `onClick()` if the certain conditions hold.
    MRVIEWER_API void earlyBackwardPass( const BackwardPassParams& backParams ) override;
 
    // Set those to set the clickable area. Zero both to hovers and clicks.
    ImVec2 clickableCornerA;
    ImVec2 clickableCornerB;
 
    // Set to false to disable hovers and clicks (`isHovered` will always be false),
    //   but still consume the mouse hover to prevent other buttons below this one from being clicked.
    bool enabled = true;
 
    // Read these to decide how to render.
    bool isHovered = false;
    bool isActive = false;
};
 
}