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Examples: SDL: Using SDL_CaptureMouse() to retrieve coordinates outside of client area when dragging. (#1559)

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Digging into sdl window/mouse stuff will also be useful for multi-viewport work.
This commit is contained in:
omar
2018-01-19 10:46:54 +01:00
parent 00351ee2ab
commit f3e510a9bf
2 changed files with 39 additions and 19 deletions
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28
examples/sdl_opengl2_example/imgui_impl_sdl_gl2.cpp
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@@ -270,23 +270,33 @@ void ImGui_ImplSdlGL2_NewFrame(SDL_Window *window)
io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f);
g_Time = current_time;
// Setup inputs
// (we already got mouse wheel, keyboard keys & characters from SDL_PollEvent())
// Setup mouse inputs (we already got mouse wheel, keyboard keys & characters from our event handler)
int mx, my;
Uint32 mouse_buttons = SDL_GetMouseState(&mx, &my);
if (SDL_GetWindowFlags(window) & SDL_WINDOW_INPUT_FOCUS)
io.MousePos = ImVec2((float)mx, (float)my);
else
io.MousePos = ImVec2(-FLT_MAX,-FLT_MAX);
io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
io.MouseWheel = g_MouseWheel;
io.MouseDown[0] = g_MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
io.MouseDown[1] = g_MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
io.MouseWheel = g_MouseWheel;
g_MouseWheel = 0.0f;
// We need to use SDL_CaptureMouse() to easily retrieve mouse coordinates outside of the client area. This is only supported from SDL 2.0.4 (released Jan 2016)
#if (SDL_MAJOR_VERSION >= 2) && (SDL_MINOR_VERSION >= 0) && (SDL_PATCHLEVEL >= 4)
if ((SDL_GetWindowFlags(window) & (SDL_WINDOW_MOUSE_FOCUS | SDL_WINDOW_MOUSE_CAPTURE)) != 0)
io.MousePos = ImVec2((float)mx, (float)my);
bool any_mouse_button_down = false;
for (int n = 0; n < IM_ARRAYSIZE(io.MouseDown); n++)
any_mouse_button_down |= io.MouseDown[n];
if (any_mouse_button_down && (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_CAPTURE) == 0)
SDL_CaptureMouse(SDL_TRUE);
if (!any_mouse_button_down && (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_CAPTURE) != 0)
SDL_CaptureMouse(SDL_FALSE);
#else
if ((SDL_GetWindowFlags(window) & SDL_WINDOW_INPUT_FOCUS) != 0)
io.MousePos = ImVec2((float)mx, (float)my);
#endif
// Hide OS mouse cursor if ImGui is drawing it
SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1);