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Allegro 5 example: handling of hardware and software mouse cursor rendering.

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This commit is contained in:
ocornut 2015-07-08 12:16:50 -06:00
parent 8db229b96f
commit 4d2d0ce5cd
1 changed files with 35 additions and 3 deletions
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38
examples/allegro5_example/imgui_impl_a5.cpp
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@ -14,9 +14,10 @@
#endif #endif
// Data // Data
static ALLEGRO_DISPLAY* g_Display = NULL; static ALLEGRO_DISPLAY* g_Display = NULL;
static ALLEGRO_BITMAP* g_Surface = NULL; static ALLEGRO_BITMAP* g_Surface = NULL;
static double g_Time = 0.0; static double g_Time = 0.0;
static ALLEGRO_MOUSE_CURSOR* g_MouseCursorInvisible = NULL;
static void ImGui_ImplA5_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count) static void ImGui_ImplA5_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
{ {
@ -117,6 +118,12 @@ bool Imgui_ImplA5_CreateDeviceObjects()
io.Fonts->ClearInputData(); io.Fonts->ClearInputData();
io.Fonts->ClearTexData(); io.Fonts->ClearTexData();
// Create an invisible mouse cursor
// Because al_hide_mouse_cursor() seems to mess up with the actual inputs..
ALLEGRO_BITMAP* mouse_cursor = al_create_bitmap(8,8);
g_MouseCursorInvisible = al_create_mouse_cursor(mouse_cursor, 0, 0);
al_destroy_bitmap(mouse_cursor);
return true; return true;
} }
@ -128,6 +135,11 @@ void ImGui_ImplA5_InvalidateDeviceObjects()
ImGui::GetIO().Fonts->TexID = NULL; ImGui::GetIO().Fonts->TexID = NULL;
g_Surface = NULL; g_Surface = NULL;
} }
if (g_MouseCursorInvisible)
{
al_destroy_mouse_cursor(g_MouseCursorInvisible);
g_MouseCursorInvisible = NULL;
}
} }
bool ImGui_ImplA5_Init(ALLEGRO_DISPLAY* display) bool ImGui_ImplA5_Init(ALLEGRO_DISPLAY* display)
@ -234,6 +246,26 @@ void ImGui_ImplA5_NewFrame()
io.MouseDown[1] = mouse.buttons & (1 << 1); io.MouseDown[1] = mouse.buttons & (1 << 1);
io.MouseDown[2] = mouse.buttons & (1 << 2); io.MouseDown[2] = mouse.buttons & (1 << 2);
// Hide OS mouse cursor if ImGui is drawing it
if (io.MouseDrawCursor)
{
al_set_mouse_cursor(g_Display, g_MouseCursorInvisible);
}
else
{
ALLEGRO_SYSTEM_MOUSE_CURSOR cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_DEFAULT;
switch (ImGui::GetMouseCursor())
{
case ImGuiMouseCursor_TextInput: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_EDIT; break;
case ImGuiMouseCursor_Move: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_MOVE; break;
case ImGuiMouseCursor_ResizeNS: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_N; break;
case ImGuiMouseCursor_ResizeEW: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_E; break;
case ImGuiMouseCursor_ResizeNESW: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NE; break;
case ImGuiMouseCursor_ResizeNWSE: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NW; break;
}
al_set_system_mouse_cursor(g_Display, cursor_id);
}
// Start the frame // Start the frame
ImGui::NewFrame(); ImGui::NewFrame();
} }