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Viewport,Platform: Added GetWindowDpiScale() platform interface, changes of scale are reflected by positioning and resizing windows in their given viewport. (#1542)

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This commit is contained in:
omar 2018-02-26 16:35:18 +01:00
parent 1eb89d7e3b
commit 43f375b2f2
3 changed files with 44 additions and 4 deletions
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44
imgui.cpp
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@ -3347,13 +3347,13 @@ static void ImGui::UpdateViewports()
const ImVec2 mouse_os_pos = ConvertViewportPosToOsDesktopPos(g.IO.MousePos, viewport_ref);
g.CurrentViewport = NULL;
for (int n = 1; n < g.Viewports.Size; n++)
for (int n = 0; n < g.Viewports.Size; n++)
{
// Erase unused viewports
ImGuiViewport* viewport = g.Viewports[n];
IM_ASSERT(viewport->Idx == n);
IM_ASSERT(!(viewport->Flags & ImGuiViewportFlags_MainViewport));
if (viewport->LastFrameActive < g.FrameCount - 2)
if (n > 0 && viewport->LastFrameActive < g.FrameCount - 2)
{
// Translate windows like if we were resizing the viewport to be zero-width
ResizeViewportTranslateWindows(n + 1, g.Viewports.Size, viewport->Pos.x - viewport->GetNextX(), -1, viewport);
@ -3380,6 +3380,19 @@ static void ImGui::UpdateViewports()
if (dx != 0.0f)
ResizeViewportTranslateWindows(viewport->Idx + 1, g.Viewports.Size, dx, 0, NULL);
}
// Update DPI Scale
float new_dpi_scale;
if (g.IO.PlatformInterface.GetWindowDpiScale)
new_dpi_scale = g.IO.PlatformInterface.GetWindowDpiScale(viewport);
else
new_dpi_scale = (viewport->PlatformDpiScale != 0.0f) ? viewport->PlatformDpiScale : 1.0f;
if (viewport->PlatformDpiScale != 0.0f && new_dpi_scale != viewport->PlatformDpiScale)
{
float scale_factor = new_dpi_scale / viewport->PlatformDpiScale;
ScaleWindowsInViewport(viewport, scale_factor);
}
viewport->PlatformDpiScale = new_dpi_scale;
}
// Update main viewport with current size (and OS window position, if known)
@ -13769,6 +13782,31 @@ static void RenderViewportThumbnail(ImDrawList* draw_list, const ImRect& bb, con
draw_list->AddRect(bb.Min, bb.Max, ImGui::GetColorU32(ImGuiCol_Border));
}
static void ScaleWindow(ImGuiWindow* window, float scale)
{
ImVec2 origin = window->Viewport->Pos;
window->Pos = window->PosFloat = ImFloor((window->PosFloat - origin) * scale + origin);
window->Size = ImFloor(window->Size * scale);
window->SizeFull = ImFloor(window->SizeFull * scale);
window->SizeContents = ImFloor(window->SizeContents * scale);
}
// Scale all windows (position, size). Use when e.g. changing DPI. (This is a lossy operation!)
void ImGui::ScaleWindowsInViewport(ImGuiViewport* viewport, float scale)
{
if (viewport->Window)
{
ScaleWindow(viewport->Window, scale);
}
else
{
ImGuiContext& g = *GImGui;
for (int i = 0; i != g.Windows.Size; i++)
if (g.Windows[i]->Viewport == viewport)
ScaleWindow(g.Windows[i], scale);
}
}
void ImGui::ShowViewportThumbnails()
{
ImGuiContext& g = *GImGui;

1
imgui.h
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@ -964,6 +964,7 @@ struct ImGuiPlatformInterface
void (*SwapBuffers)(ImGuiViewport* viewport);
// FIXME-DPI
float (*GetWindowDpiScale)(ImGuiViewport* viewport); // (Optional)
void (*BeginViewport)(ImGuiViewport* viewport); // (Optional) Called during Begin() every time the viewport we are outputting into changes (viewport = next viewport)
void (*EndViewport)(ImGuiViewport* viewport); // (Optional) Called during Begin() every time the viewport we are outputting into changes (viewport = previous viewport)
};

3
imgui_internal.h
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@ -546,7 +546,7 @@ struct ImGuiViewport
bool PlatformRequestResize; // Platform window requested resize
void* RendererUserData; // void* to hold custom data structure for the renderer (e.g. framebuffer)
ImGuiViewport(ImGuiID id, int idx) { ID = id; Idx = idx; Flags = 0; LastFrameActive = LastFrameAsRefViewport = -1; LastNameHash = 0; Window = NULL; PlatformDpiScale = 1.0f; PlatformUserData = PlatformHandle = NULL; PlatformRequestClose = PlatformRequestResize = false; RendererUserData = NULL; }
ImGuiViewport(ImGuiID id, int idx) { ID = id; Idx = idx; Flags = 0; LastFrameActive = LastFrameAsRefViewport = -1; LastNameHash = 0; Window = NULL; PlatformDpiScale = 0.0f; PlatformUserData = PlatformHandle = NULL; PlatformRequestClose = PlatformRequestResize = false; RendererUserData = NULL; }
~ImGuiViewport() { IM_ASSERT(PlatformUserData == NULL && RendererUserData == NULL); }
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; }
@ -1092,6 +1092,7 @@ namespace ImGui
IMGUI_API ImGuiViewport* FindViewportByID(ImGuiID id);
IMGUI_API ImGuiViewport* FindViewportByPlatformHandle(void* platform_handle);
IMGUI_API void SetNextWindowViewport(ImGuiID id);
IMGUI_API void ScaleWindowsInViewport(ImGuiViewport* viewport, float scale);
IMGUI_API void ShowViewportThumbnails();
IMGUI_API void DestroyViewportsPlaformData(ImGuiContext* context);
IMGUI_API void DestroyViewportsRendererData(ImGuiContext* context);