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Added SetNextWindowBgAlpha() helper. (#1567) particularly helpul with the marking of the old 5-parameters version of Begin() as obsolete.

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This commit is contained in:
omar 2018-01-23 19:13:49 +01:00
parent 2645ab5f7f
commit 9a76fd30fd
4 changed files with 22 additions and 20 deletions
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31
imgui.cpp
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@ -4803,8 +4803,10 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
}
else
{
// Window background, Default Alpha
// Window background
ImU32 bg_col = GetColorU32(GetWindowBgColorIdxFromFlags(flags));
if (g.NextWindowData.BgAlphaCond != 0)
bg_col = (bg_col & ~IM_COL32_A_MASK) | (IM_F32_TO_INT8_SAT(g.NextWindowData.BgAlphaVal) << IM_COL32_A_SHIFT);
window->DrawList->AddRectFilled(window->Pos+ImVec2(0,window->TitleBarHeight()), window->Pos+window->Size, bg_col, window_rounding, (flags & ImGuiWindowFlags_NoTitleBar) ? ImDrawCornerFlags_All : ImDrawCornerFlags_Bot);
// Title bar
@ -5010,22 +5012,12 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
{
// Old API feature: we could pass the initial window size as a parameter, however this was very misleading because in most cases it would only affect the window when it didn't have storage in the .ini file.
if (size_on_first_use.x != 0.0f || size_on_first_use.y != 0.0f)
SetNextWindowSize(size_on_first_use, ImGuiCond_FirstUseEver);
ImGui::SetNextWindowSize(size_on_first_use, ImGuiCond_FirstUseEver);
// Old API feature: we could override the window background alpha with a parameter. This is actually tricky to reproduce manually because:
// (1) there are multiple variants of WindowBg (popup, tooltip, etc.) and (2) you can't call PushStyleColor before Begin and PopStyleColor just after Begin() because of how CheckStackSizes() behave.
// The user-side solution is to do backup = GetStyleColorVec4(ImGuiCol_xxxBG), PushStyleColor(ImGuiCol_xxxBg), Begin, PushStyleColor(ImGuiCol_xxxBg, backup), [...], PopStyleColor(), End(); PopStyleColor() - which is super awkward.
// The alpha override was rarely used but for now we'll leave the Begin() variant around for a bit. We may either lift the constraint on CheckStackSizes() either add a SetNextWindowBgAlpha() helper that does it magically.
ImGuiContext& g = *GImGui;
const ImGuiCol bg_color_idx = GetWindowBgColorIdxFromFlags(flags);
const ImVec4 bg_color_backup = g.Style.Colors[bg_color_idx];
if (bg_alpha_override >= 0.0f)
g.Style.Colors[bg_color_idx].w = bg_alpha_override;
// Old API feature: override the window background alpha with a parameter.
ImGui::SetNextWindowBgAlpha(bg_alpha_override);
bool ret = Begin(name, p_open, flags);
if (bg_alpha_override >= 0.0f)
g.Style.Colors[bg_color_idx] = bg_color_backup;
bool ret = ImGui::Begin(name, p_open, flags);
return ret;
}
#endif // IMGUI_DISABLE_OBSOLETE_FUNCTIONS
@ -5803,7 +5795,14 @@ void ImGui::SetNextWindowCollapsed(bool collapsed, ImGuiCond cond)
void ImGui::SetNextWindowFocus()
{
ImGuiContext& g = *GImGui;
g.NextWindowData.FocusCond = ImGuiCond_Always;
g.NextWindowData.FocusCond = ImGuiCond_Always; // Using a Cond member for consistency (may transition all of them to single flag set for fast Clear() op)
}
void ImGui::SetNextWindowBgAlpha(float alpha)
{
ImGuiContext& g = *GImGui;
g.NextWindowData.BgAlphaVal = alpha;
g.NextWindowData.BgAlphaCond = ImGuiCond_Always; // Using a Cond member for consistency (may transition all of them to single flag set for fast Clear() op)
}
// In window space (not screen space!)

1
imgui.h
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@ -171,6 +171,7 @@ namespace ImGui
IMGUI_API void SetNextWindowContentSize(const ImVec2& size); // set next window content size (~ enforce the range of scrollbars). not including window decorations (title bar, menu bar, etc.). set an axis to 0.0f to leave it automatic. call before Begin()
IMGUI_API void SetNextWindowCollapsed(bool collapsed, ImGuiCond cond = 0); // set next window collapsed state. call before Begin()
IMGUI_API void SetNextWindowFocus(); // set next window to be focused / front-most. call before Begin()
IMGUI_API void SetNextWindowBgAlpha(float alpha); // set next window background color alpha. helper to easily modify ImGuiCol_WindowBg/ChildBg/PopupBg.
IMGUI_API void SetWindowPos(const ImVec2& pos, ImGuiCond cond = 0); // (not recommended) set current window position - call within Begin()/End(). prefer using SetNextWindowPos(), as this may incur tearing and side-effects.
IMGUI_API void SetWindowSize(const ImVec2& size, ImGuiCond cond = 0); // (not recommended) set current window size - call within Begin()/End(). set to ImVec2(0,0) to force an auto-fit. prefer using SetNextWindowSize(), as this may incur tearing and minor side-effects.
IMGUI_API void SetWindowCollapsed(bool collapsed, ImGuiCond cond = 0); // (not recommended) set current window collapsed state. prefer using SetNextWindowCollapsed().

3
imgui_demo.cpp
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@ -2398,7 +2398,7 @@ static void ShowExampleAppFixedOverlay(bool* p_open)
ImVec2 window_pos = ImVec2((corner & 1) ? ImGui::GetIO().DisplaySize.x - DISTANCE : DISTANCE, (corner & 2) ? ImGui::GetIO().DisplaySize.y - DISTANCE : DISTANCE);
ImVec2 window_pos_pivot = ImVec2((corner & 1) ? 1.0f : 0.0f, (corner & 2) ? 1.0f : 0.0f);
ImGui::SetNextWindowPos(window_pos, ImGuiCond_Always, window_pos_pivot);
ImGui::PushStyleColor(ImGuiCol_WindowBg, ImVec4(0.0f, 0.0f, 0.0f, 0.3f)); // Transparent background
ImGui::SetNextWindowBgAlpha(0.3f); // Transparent background
if (ImGui::Begin("Example: Fixed Overlay", p_open, ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_NoResize|ImGuiWindowFlags_AlwaysAutoResize|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_NoSavedSettings))
{
ImGui::Text("Simple overlay\nin the corner of the screen.\n(right-click to change position)");
@ -2415,7 +2415,6 @@ static void ShowExampleAppFixedOverlay(bool* p_open)
}
ImGui::End();
}
ImGui::PopStyleColor();
}
// Demonstrate using "##" and "###" in identifiers to manipulate ID generation.

7
imgui_internal.h
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@ -467,6 +467,7 @@ struct ImGuiNextWindowData
ImGuiCond CollapsedCond;
ImGuiCond SizeConstraintCond;
ImGuiCond FocusCond;
ImGuiCond BgAlphaCond;
ImVec2 PosVal;
ImVec2 PosPivotVal;
ImVec2 SizeVal;
@ -475,21 +476,23 @@ struct ImGuiNextWindowData
ImRect SizeConstraintRect; // Valid if 'SetNextWindowSizeConstraint' is true
ImGuiSizeCallback SizeCallback;
void* SizeCallbackUserData;
float BgAlphaVal;
ImGuiNextWindowData()
{
PosCond = SizeCond = ContentSizeCond = CollapsedCond = SizeConstraintCond = FocusCond = 0;
PosCond = SizeCond = ContentSizeCond = CollapsedCond = SizeConstraintCond = FocusCond = BgAlphaCond = 0;
PosVal = PosPivotVal = SizeVal = ImVec2(0.0f, 0.0f);
ContentSizeVal = ImVec2(0.0f, 0.0f);
CollapsedVal = false;
SizeConstraintRect = ImRect();
SizeCallback = NULL;
SizeCallbackUserData = NULL;
BgAlphaVal = FLT_MAX;
}
void Clear()
{
PosCond = SizeCond = ContentSizeCond = CollapsedCond = SizeConstraintCond = FocusCond = 0;
PosCond = SizeCond = ContentSizeCond = CollapsedCond = SizeConstraintCond = FocusCond = BgAlphaCond = 0;
}
};