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Viewports, Docking: Added per-viewport work area system for e.g. menu-bars. Fixed DocksapceOverViewport() and demo code (overlay etc) (#3035, #2889, #2474, #1542, #2109)

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Clarified that BeginMenuMainBar() had an incorrect knowledge of its height (which was previously harmless).
Designed to easily allow for status bars although we don't have/use them yet, but custom code could use them.
This commit is contained in:
ocornut
2020-02-26 23:58:45 +01:00
parent f032ad6b1f
commit 75de34e281
5 changed files with 64 additions and 25 deletions
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16
imgui.h
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@@ -2468,14 +2468,18 @@ enum ImGuiViewportFlags_
ImGuiViewportFlags_CanHostOtherWindows = 1 << 9 // Main viewport: can host multiple imgui windows (secondary viewports are associated to a single window).
};
// The viewports created and managed by imgui. The role of the platform back-end is to create the platform/OS windows corresponding to each viewport.
// The viewports created and managed by Dear ImGui. The role of the platform back-end is to create the platform/OS windows corresponding to each viewport.
// - Main Area = entire viewport.
// - Work Area = entire viewport minus sections optionally used by menu bars, status bars. Some positioning code will prefer to use this. Window are also trying to stay within this area.
struct ImGuiViewport
{
ImGuiID ID; // Unique identifier for the viewport
ImGuiViewportFlags Flags; // See ImGuiViewportFlags_
ImVec2 Pos; // Position of viewport both in imgui space and in OS desktop/native space
ImVec2 Size; // Size of viewport in pixel
float DpiScale; // 1.0f = 96 DPI = No extra scale
ImVec2 Pos; // Main Area: Position of the viewport (the imgui coordinates are the same as OS desktop/native coordinates)
ImVec2 Size; // Main Area: Size of the viewport.
ImVec2 WorkOffsetMin; // Work Area: Offset from Pos to top-left corner of Work Area. Generally (0,0) or (0,+main_menu_bar_height). Work Area is Full Area but without menu-bars/status-bars (so WorkArea always fit inside Pos/Size!)
ImVec2 WorkOffsetMax; // Work Area: Offset from Pos+Size to bottom-right corner of Work Area. Generally (0,0) or (0,-status_bar_height).
float DpiScale; // 1.0f = 96 DPI = No extra scale.
ImDrawData* DrawData; // The ImDrawData corresponding to this viewport. Valid after Render() and until the next call to NewFrame().
ImGuiID ParentViewportId; // (Advanced) 0: no parent. Instruct the platform back-end to setup a parent/child relationship between platform windows.
@@ -2491,6 +2495,10 @@ struct ImGuiViewport
ImGuiViewport() { ID = 0; Flags = 0; DpiScale = 0.0f; DrawData = NULL; ParentViewportId = 0; RendererUserData = PlatformUserData = PlatformHandle = PlatformHandleRaw = NULL; PlatformRequestMove = PlatformRequestResize = PlatformRequestClose = false; }
~ImGuiViewport() { IM_ASSERT(PlatformUserData == NULL && RendererUserData == NULL); }
// Access work-area rectangle
ImVec2 GetWorkPos() { return ImVec2(Pos.x + WorkOffsetMin.x, Pos.y + WorkOffsetMin.y); }
ImVec2 GetWorkSize() { return ImVec2(Size.x - WorkOffsetMin.x + WorkOffsetMax.x, Size.y - WorkOffsetMin.y + WorkOffsetMax.y); } // This not clamped
};
#if defined(__clang__)