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Expose BeginDisabled()/EndDisabled() in public API. Add to demo. (#211)

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ocornut
2021-07-19 19:21:18 +02:00
parent cb00972b87
commit c543d93af1
6 changed files with 68 additions and 33 deletions
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20
imgui.cpp
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@ -988,7 +988,8 @@ static void* GImAllocatorUserData = NULL;
ImGuiStyle::ImGuiStyle()
{
Alpha = 1.0f; // Global alpha applies to everything in ImGui
Alpha = 1.0f; // Global alpha applies to everything in Dear ImGui.
DisabledAlpha = 0.60f; // Additional alpha multiplier for disabled items (multiply over current value of Alpha).
WindowPadding = ImVec2(8,8); // Padding within a window
WindowRounding = 0.0f; // Radius of window corners rounding. Set to 0.0f to have rectangular windows. Large values tend to lead to variety of artifacts and are not recommended.
WindowBorderSize = 1.0f; // Thickness of border around windows. Generally set to 0.0f or 1.0f. Other values not well tested.
@ -2533,6 +2534,7 @@ struct ImGuiStyleVarInfo
static const ImGuiStyleVarInfo GStyleVarInfo[] =
{
{ ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, Alpha) }, // ImGuiStyleVar_Alpha
{ ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, DisabledAlpha) }, // ImGuiStyleVar_DisabledAlpha
{ ImGuiDataType_Float, 2, (ImU32)IM_OFFSETOF(ImGuiStyle, WindowPadding) }, // ImGuiStyleVar_WindowPadding
{ ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, WindowRounding) }, // ImGuiStyleVar_WindowRounding
{ ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, WindowBorderSize) }, // ImGuiStyleVar_WindowBorderSize
@ -6615,23 +6617,21 @@ void ImGui::PopItemFlag()
g.CurrentItemFlags = g.ItemFlagsStack.back();
}
// PushDisabled()/PopDisabled()
// - Those can be nested but this cannot be used to enable an already disabled section (a single PushDisabled(true) in the stack is enough to keep things disabled)
// - Those are not yet exposed in imgui.h because we are unsure of how to alter the style in a way that works for everyone.
// We may rework this. Hypothetically, a future styling system may set a flag which make widgets use different colors.
// BeginDisabled()/EndDisabled()
// - Those can be nested but this cannot be used to enable an already disabled section (a single BeginDisabled(true) in the stack is enough to keep things disabled)
// - Visually this is currently altering alpha, but it is expected that in a future styling system this would work differently.
// - Feedback welcome at https://github.com/ocornut/imgui/issues/211
// - You may trivially implement your own variation of this if needed.
// Here we test (CurrentItemFlags & ImGuiItemFlags_Disabled) to allow nested PushDisabled() calls.
void ImGui::PushDisabled(bool disabled)
// - BeginDisabled(false) essentially does nothing but is provided to facilitate use of boolean expressions
void ImGui::BeginDisabled(bool disabled)
{
ImGuiContext& g = *GImGui;
bool was_disabled = (g.CurrentItemFlags & ImGuiItemFlags_Disabled) != 0;
if (!was_disabled && disabled)
PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * 0.6f);
PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * g.Style.DisabledAlpha);
PushItemFlag(ImGuiItemFlags_Disabled, was_disabled || disabled);
}
void ImGui::PopDisabled()
void ImGui::EndDisabled()
{
ImGuiContext& g = *GImGui;
bool was_disabled = (g.CurrentItemFlags & ImGuiItemFlags_Disabled) != 0;