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Viewport, Platform, Examples: Added support for transparent window via PlatformIO Platform_SetWindowAlpha (#1542) + fixes for GLFW 3.3

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This commit is contained in:
omar 2018-04-05 17:06:23 +02:00
parent 84c6ea0cee
commit 72899318e6
4 changed files with 41 additions and 3 deletions
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16
examples/imgui_impl_glfw.cpp
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@ -39,6 +39,7 @@
#else
#define GLFW_HAS_GLFW_HOVERED 0
#endif
#define GLFW_HAS_WINDOW_ALPHA (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+
#define GLFW_HAS_VULKAN (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3200) // 3.2+
// Data
@ -235,8 +236,8 @@ static void ImGui_ImplGlfw_UpdateMouse()
}
#if GLFW_HAS_GLFW_HOVERED
io.ConfigFlags |= ImGuiConfigFlags_PlatformHasMouseHoveredViewport;
if (glfwGetWindowAttrib(data->Window, GLFW_HOVERED) && !(viewport->Flags & ImGuiViewportFlags_NoInputs))
io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport;
if (glfwGetWindowAttrib(window, GLFW_HOVERED) && !(viewport->Flags & ImGuiViewportFlags_NoInputs))
io.MouseHoveredViewport = viewport->ID;
#endif
}
@ -469,6 +470,14 @@ static void ImGui_ImplGlfw_SetWindowTitle(ImGuiViewport* viewport, const char* t
glfwSetWindowTitle(data->Window, title);
}
#if GLFW_HAS_WINDOW_ALPHA
static void ImGui_ImplGlfw_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
{
ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
glfwSetWindowOpacity(data->Window, alpha);
}
#endif
static void ImGui_ImplGlfw_RenderWindow(ImGuiViewport* viewport, void*)
{
ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
@ -522,6 +531,9 @@ static void ImGui_ImplGlfw_InitPlatformInterface()
platform_io.Platform_SetWindowTitle = ImGui_ImplGlfw_SetWindowTitle;
platform_io.Platform_RenderWindow = ImGui_ImplGlfw_RenderWindow;
platform_io.Platform_SwapBuffers = ImGui_ImplGlfw_SwapBuffers;
#if GLFW_HAS_WINDOW_ALPHA
platform_io.Platform_SetWindowAlpha = ImGui_ImplGlfw_SetWindowAlpha;
#endif
#if GLFW_HAS_VULKAN
platform_io.Platform_CreateVkSurface = ImGui_ImplGlfw_CreateVkSurface;
#endif

19
examples/imgui_impl_win32.cpp
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@ -472,6 +472,24 @@ static void ImGui_ImplWin32_SetWindowTitle(ImGuiViewport* viewport, const char*
::SetWindowTextA(data->Hwnd, title);
}
static void ImGui_ImplWin32_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
{
ImGuiViewportDataWin32* data = (ImGuiViewportDataWin32*)viewport->PlatformUserData;
IM_ASSERT(data->Hwnd != 0);
IM_ASSERT(alpha >= 0.0f && alpha <= 1.0f);
if (alpha < 1.0f)
{
DWORD style = ::GetWindowLongW(data->Hwnd, GWL_EXSTYLE) | WS_EX_LAYERED;
::SetWindowLongW(data->Hwnd, GWL_EXSTYLE, style);
::SetLayeredWindowAttributes(data->Hwnd, 0, (BYTE)(255 * alpha), LWA_ALPHA);
}
else
{
DWORD style = ::GetWindowLongW(data->Hwnd, GWL_EXSTYLE) & ~WS_EX_LAYERED;
::SetWindowLongW(data->Hwnd, GWL_EXSTYLE, style);
}
}
static float ImGui_ImplWin32_GetWindowDpiScale(ImGuiViewport* viewport)
{
ImGuiViewportDataWin32* data = (ImGuiViewportDataWin32*)viewport->PlatformUserData;
@ -543,6 +561,7 @@ static void ImGui_ImplWin32_InitPlatformInterface()
platform_io.Platform_SetWindowSize = ImGui_ImplWin32_SetWindowSize;
platform_io.Platform_GetWindowSize = ImGui_ImplWin32_GetWindowSize;
platform_io.Platform_SetWindowTitle = ImGui_ImplWin32_SetWindowTitle;
platform_io.Platform_SetWindowAlpha = ImGui_ImplWin32_SetWindowAlpha;
platform_io.Platform_GetWindowDpiScale = ImGui_ImplWin32_GetWindowDpiScale;
// Register main window handle

5
imgui.cpp
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@ -3578,6 +3578,11 @@ void ImGui::UpdatePlatformWindows()
ImGui::MemFree(title_displayed);
}
// Update alpha
if (viewport->LastAlpha != viewport->Alpha && g.PlatformIO.Platform_SetWindowAlpha)
g.PlatformIO.Platform_SetWindowAlpha(viewport, viewport->Alpha);
viewport->LastAlpha = viewport->Alpha;
// Show window. On startup ensure platform window don't get focus.
if (is_new_window)
{

4
imgui_internal.h
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@ -517,13 +517,15 @@ struct ImGuiViewportP : public ImGuiViewport
int LastFrameActive; // Last frame number this viewport was activated by a window
int LastFrameAsRefViewport; // Last frame number this viewport was io.MouseViewportRef
ImGuiID LastNameHash;
float Alpha; // Window opacity (when dragging dockable windows/viewports we make them transparent)
float LastAlpha;
ImGuiWindow* Window;
ImDrawList* OverlayDrawList; // For convenience, a draw list we can render to that's always rendered last (we use it to draw software mouse cursor when io.MouseDrawCursor is set)
ImDrawData DrawDataP;
ImDrawDataBuilder DrawDataBuilder;
ImVec2 RendererLastSize;
ImGuiViewportP(ImDrawListSharedData* draw_list_shared_data) { Idx = 1; LastFrameActive = LastFrameAsRefViewport = -1; LastNameHash = 0; Window = NULL; OverlayDrawList = IM_NEW(ImDrawList)(draw_list_shared_data); OverlayDrawList->_OwnerName = "##Overlay"; RendererLastSize = ImVec2(-1.0f,-1.0f); }
ImGuiViewportP(ImDrawListSharedData* draw_list_shared_data) { Idx = 1; LastFrameActive = LastFrameAsRefViewport = -1; LastNameHash = 0; Alpha = LastAlpha = 1.0f; Window = NULL; OverlayDrawList = IM_NEW(ImDrawList)(draw_list_shared_data); OverlayDrawList->_OwnerName = "##Overlay"; RendererLastSize = ImVec2(-1.0f,-1.0f); }
~ImGuiViewportP() { IM_DELETE(OverlayDrawList); }
ImRect GetRect() const { return ImRect(Pos.x, Pos.y, Pos.x + Size.x, Pos.y + Size.y); }
float GetNextX() const { const float SPACING = 4.0f; return Pos.x + Size.x + SPACING; }