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Proof of Concept source file attached.

main.cpp (text/plain), 3.47 KB, created by M-Griffin on 2015-01-12 05:52:01 UTC

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Filename:

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Creator: M-Griffin

Created: 2015-01-12 05:52:01 UTC

Size: 3.47 KB

patch

obsolete

>/*
> * Proof Of Concet for Mouse Event Bug
> * Michael Griffin <mrmisticismo@hotmail.com>
> *
> * Issue, if you click on the canvus, then click to the Desktop to switch
> * Window focus.  Once you click on your windows Title Bar the MOUSEBUTTONDOWN
> * Event is triggered, and event.button.botton will continure to show a the
> * button as being held down after the release.
> *
> * This examples tracks LEFT Mouse clicks, for example selection for copy/paste
> * If you left click and release on canvas everything is fine.
> * Once you switch focus to desktop to do other things then come back and
> * click the SDL Program's title bar, the event.button.button stays populated
> * and MOUSEMOTION still sees a LEFT button as being held downbecasue
> * no release MOUSEBUTTONUP was register when clicking the title bar.
> *
> * An extra isMouseSelection is set on buttondown, and reset on buttonup.
> * Button up never happnens and the event.button.button is never cleared
> * causing the issue.
> */
>
>#include <SDL.h>
>#include <iostream>
>
>bool isMouseSelection = false;
>
>bool init()
>{
>    //Initialize all SDL subsystems
>	if (SDL_Init(SDL_INIT_VIDEO) == -1)
>	{
>		return false;
>	}
>
>    // Quick setup of Window and Renderer
>    SDL_Window *globalWindow =
>        SDL_CreateWindow("MouseBug", SDL_WINDOWPOS_CENTERED,
>        SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
>
>    if(globalWindow != NULL) // window init success
>    {
>        std::cout << "window creation success\n";
>        SDL_Renderer *globalRenderer =
>            SDL_CreateRenderer(globalWindow, -1,
>                SDL_RENDERER_ACCELERATED |
>                SDL_RENDERER_TARGETTEXTURE);
>
>        if(globalRenderer != NULL) // renderer init success
>        {
>            std::cout << "renderer creation success" << std::endl;
>            SDL_SetRenderDrawColor(globalRenderer, 0x00, 0x00, 0x00, 0xFF);
>        }
>        else
>            return false;
>    }
>    else
>        return false;
>
>    return true;
>}
>
>int main(int argc, char* args[])
>{
>
>    // Init a basic SDL window.
>    if (!init())
>        return false;
>   
>
>    bool quit = false;
>	SDL_Event event;
>
>	//While the user hasn't quit
>	while (!quit)
>	{
>		//While there's events to handle
>		while (SDL_PollEvent(&event))
>		{
>			switch (event.type)
>			{
>				case SDL_MOUSEBUTTONUP:
>					// If the left mouse button release, reset flag to false!
>					if (event.button.button == SDL_BUTTON_LEFT)
>					{
>						isMouseSelection = false;
>
>						//Debuggin: Get the mouse offsets
>						std::cout << "Mouse released at: " << event.button.x << "," << event.button.y << std::endl;
>					}
>					break;
>
>				case SDL_MOUSEBUTTONDOWN:
>					// We want mouse down on left button only.
>					if (event.button.button == SDL_BUTTON_LEFT)
>					{
>						// Mark extra flag that the mouse down has executed.
>						isMouseSelection = true;
>
>						//Debuggin: Get the mouse offsets
>						std::cout << "Mouse pressed at: " << event.button.x << "," << event.button.y << std::endl;
>					}
>					break;
>
>				case SDL_MOUSEMOTION:
>					// We only want Motion when the Left button is down!
>					// And isMouseSelection is TRUE
>					if (event.button.button == SDL_BUTTON_LEFT
>						&& isMouseSelection)
>					{
>						std::cout << "Mouse moved by: "
>							<< event.motion.xrel << ", " << event.motion.yrel
>							<< " : "
>							<< event.motion.x << "," << event.motion.y
>							<< std::endl;
>					}
>					break;
>
>				case SDL_QUIT:
>					//Quit the program
>					quit = true;
>					break;
>
>				default:
>					break;
>            }
>		}
>	}
>
>    // Done.
>    SDL_Quit();
>	return 0;
>}
>

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We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.