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Windows, Internal: added experimental SkipRefresh mode. (#3515, #4763, #7556, #5116 , #4076, #2749, #2268)

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currently: ImGui::SetNextWindowRefreshPolicy(ImGuiWindowRefreshFlags_TryToAvoidRefresh);
- This is NOT meant to replace frame-wide/app-wide idle mode.
- This is another tool: the idea that a given window could avoid refresh and reuse last frame contents.
- I think it needs to be backed by a careful and smart design overall (refresh policy, load balancing, making it easy and obvious to user).
- It's not there yet, this is currently a toy for experimenting.
My other issues with this:
- It appears to be very simple, but skipping most of Begin() logic will inevitably lead to tricky/confusing bugs. Let's see how it goes.
- I don't like very much that this opens a door to varying inconsistencies
- I don't like very much that it can lead us to situation where the lazy refresh gets disabled in bulk due to some reason (e.g. resizing a dock space) and we get sucked in the temptation to update for idle rather than update for dynamism.
This commit is contained in:
ocornut 2024-05-03 18:04:07 +02:00
parent 0b309471f2
commit d4495446d5
4 changed files with 79 additions and 4 deletions
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17
imgui_internal.h
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@ -182,6 +182,7 @@ typedef int ImGuiSeparatorFlags; // -> enum ImGuiSeparatorFlags_ // F
typedef int ImGuiTextFlags; // -> enum ImGuiTextFlags_ // Flags: for TextEx()
typedef int ImGuiTooltipFlags; // -> enum ImGuiTooltipFlags_ // Flags: for BeginTooltipEx()
typedef int ImGuiTypingSelectFlags; // -> enum ImGuiTypingSelectFlags_ // Flags: for GetTypingSelectRequest()
typedef int ImGuiWindowRefreshFlags; // -> enum ImGuiWindowRefreshFlags_ // Flags: for SetNextWindowRefreshPolicy()
typedef void (*ImGuiErrorLogCallback)(void* user_data, const char* fmt, ...);
@ -1117,6 +1118,15 @@ struct IMGUI_API ImGuiInputTextState
};
enum ImGuiWindowRefreshFlags_
{
ImGuiWindowRefreshFlags_None = 0,
ImGuiWindowRefreshFlags_TryToAvoidRefresh = 1 << 0, // [EXPERIMENTAL] Try to keep existing contents, USER MUST NOT HONOR BEGIN() RETURNING FALSE AND NOT APPEND.
ImGuiWindowRefreshFlags_RefreshOnHover = 1 << 1, // [EXPERIMENTAL] Always refresh on hover
ImGuiWindowRefreshFlags_RefreshOnFocus = 1 << 2, // [EXPERIMENTAL] Always refresh on focus
// Refresh policy/frequency, Load Balancing etc.
};
enum ImGuiNextWindowDataFlags_
{
ImGuiNextWindowDataFlags_None = 0,
@ -1129,6 +1139,7 @@ enum ImGuiNextWindowDataFlags_
ImGuiNextWindowDataFlags_HasBgAlpha = 1 << 6,
ImGuiNextWindowDataFlags_HasScroll = 1 << 7,
ImGuiNextWindowDataFlags_HasChildFlags = 1 << 8,
ImGuiNextWindowDataFlags_HasRefreshPolicy = 1 << 9,
};
// Storage for SetNexWindow** functions
@ -1150,6 +1161,7 @@ struct ImGuiNextWindowData
void* SizeCallbackUserData;
float BgAlphaVal; // Override background alpha
ImVec2 MenuBarOffsetMinVal; // (Always on) This is not exposed publicly, so we don't clear it and it doesn't have a corresponding flag (could we? for consistency?)
ImGuiWindowRefreshFlags RefreshFlagsVal;
ImGuiNextWindowData() { memset(this, 0, sizeof(*this)); }
inline void ClearFlags() { Flags = ImGuiNextWindowDataFlags_None; }
@ -2534,6 +2546,7 @@ struct IMGUI_API ImGuiWindow
bool Collapsed; // Set when collapsing window to become only title-bar
bool WantCollapseToggle;
bool SkipItems; // Set when items can safely be all clipped (e.g. window not visible or collapsed)
bool SkipRefresh; // [EXPERIMENTAL] Reuse previous frame drawn contents, Begin() returns false.
bool Appearing; // Set during the frame where the window is appearing (or re-appearing)
bool Hidden; // Do not display (== HiddenFrames*** > 0)
bool IsFallbackWindow; // Set on the "Debug##Default" window.
@ -3007,6 +3020,7 @@ namespace ImGui
IMGUI_API ImGuiWindow* FindWindowByID(ImGuiID id);
IMGUI_API ImGuiWindow* FindWindowByName(const char* name);
IMGUI_API void UpdateWindowParentAndRootLinks(ImGuiWindow* window, ImGuiWindowFlags flags, ImGuiWindow* parent_window);
IMGUI_API void UpdateWindowSkipRefresh(ImGuiWindow* window);
IMGUI_API ImVec2 CalcWindowNextAutoFitSize(ImGuiWindow* window);
IMGUI_API bool IsWindowChildOf(ImGuiWindow* window, ImGuiWindow* potential_parent, bool popup_hierarchy);
IMGUI_API bool IsWindowWithinBeginStackOf(ImGuiWindow* window, ImGuiWindow* potential_parent);
@ -3032,6 +3046,9 @@ namespace ImGui
IMGUI_API int FindWindowDisplayIndex(ImGuiWindow* window);
IMGUI_API ImGuiWindow* FindBottomMostVisibleWindowWithinBeginStack(ImGuiWindow* window);
// Windows: Idle, Refresh Policies [EXPERIMENTAL]
IMGUI_API void SetNextWindowRefreshPolicy(ImGuiWindowRefreshFlags flags);
// Fonts, drawing
IMGUI_API void SetCurrentFont(ImFont* font);
inline ImFont* GetDefaultFont() { ImGuiContext& g = *GImGui; return g.IO.FontDefault ? g.IO.FontDefault : g.IO.Fonts->Fonts[0]; }