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Internals: extracted a more reusable BeginViewportSideBar() out of BeginMainMenuBar(). (#3966, #3518)

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Complement ca34c81c in docking branch which removed assumption that we can't tell size ahead of Begin().
This commit is contained in:
ocornut
2021-03-25 16:16:48 +01:00
parent aa5431fde2
commit a58271c079
3 changed files with 66 additions and 41 deletions
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79
imgui_widgets.cpp
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@ -6602,46 +6602,63 @@ void ImGui::EndMenuBar()
window->DC.MenuBarAppending = false;
}
// Important: calling order matters!
// FIXME: Somehow overlapping with docking tech.
// FIXME: The "rect-cut" aspect of this could be formalized into a lower-level helper (rect-cut: https://halt.software/dead-simple-layouts)
bool ImGui::BeginViewportSideBar(const char* name, ImGuiViewport* viewport_p, ImGuiDir dir, float axis_size, ImGuiWindowFlags window_flags)
{
IM_ASSERT(dir != ImGuiDir_None);
ImGuiWindow* bar_window = FindWindowByName(name);
if (bar_window == NULL || bar_window->BeginCount == 0)
{
// Calculate and set window size/position
ImGuiViewportP* viewport = (ImGuiViewportP*)(void*)(viewport_p ? viewport_p : GetMainViewport());
ImRect avail_rect = viewport->GetBuildWorkRect();
ImGuiAxis axis = (dir == ImGuiDir_Up || dir == ImGuiDir_Down) ? ImGuiAxis_Y : ImGuiAxis_X;
ImVec2 pos = avail_rect.Min;
if (dir == ImGuiDir_Right || dir == ImGuiDir_Down)
pos[axis] = avail_rect.Max[axis] - axis_size;
ImVec2 size = avail_rect.GetSize();
size[axis] = axis_size;
SetNextWindowPos(pos);
SetNextWindowSize(size);
// Report our size into work area (for next frame) using actual window size
if (dir == ImGuiDir_Up || dir == ImGuiDir_Left)
viewport->BuildWorkOffsetMin[axis] += axis_size;
else if (dir == ImGuiDir_Down || dir == ImGuiDir_Right)
viewport->BuildWorkOffsetMax[axis] -= axis_size;
}
window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
PushStyleVar(ImGuiStyleVar_WindowMinSize, ImVec2(0, 0)); // Lift normal size constraint
bool is_open = Begin(name, NULL, window_flags);
PopStyleVar(2);
return is_open;
}
bool ImGui::BeginMainMenuBar()
{
ImGuiContext& g = *GImGui;
ImGuiViewportP* viewport = (ImGuiViewportP*)(void*)GetMainViewport();
ImGuiWindow* menu_bar_window = FindWindowByName("##MainMenuBar");
// For the main menu bar, which cannot be moved, we honor g.Style.DisplaySafeAreaPadding to ensure text can be visible on a TV set.
// FIXME: This could be generalized as an opt-in way to clamp window->DC.CursorStartPos to avoid SafeArea?
// FIXME: Consider removing support for safe area down the line... it's messy. Nowadays consoles have support for TV calibration in OS settings.
g.NextWindowData.MenuBarOffsetMinVal = ImVec2(g.Style.DisplaySafeAreaPadding.x, ImMax(g.Style.DisplaySafeAreaPadding.y - g.Style.FramePadding.y, 0.0f));
// Get our rectangle at the top of the work area
if (menu_bar_window == NULL || menu_bar_window->BeginCount == 0)
{
// Set window position
// We don't attempt to calculate our height ahead, as it depends on the per-viewport font size.
// However menu-bar will affect the minimum window size so we'll get the right height.
ImVec2 menu_bar_pos = viewport->Pos + viewport->CurrWorkOffsetMin;
ImVec2 menu_bar_size = ImVec2(viewport->Size.x - viewport->CurrWorkOffsetMin.x + viewport->CurrWorkOffsetMax.x, 1.0f);
SetNextWindowPos(menu_bar_pos);
SetNextWindowSize(menu_bar_size);
}
// Create window
PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
PushStyleVar(ImGuiStyleVar_WindowMinSize, ImVec2(0, 0)); // Lift normal size constraint, however the presence of a menu-bar will give us the minimum height we want.
ImGuiWindowFlags window_flags = ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_MenuBar;
bool is_open = Begin("##MainMenuBar", NULL, window_flags) && BeginMenuBar();
PopStyleVar(2);
// Report our size into work area (for next frame) using actual window size
menu_bar_window = GetCurrentWindow();
if (menu_bar_window->BeginCount == 1)
viewport->CurrWorkOffsetMin.y += menu_bar_window->Size.y;
ImGuiWindowFlags window_flags = ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_MenuBar;
float height = GetFrameHeight();
bool is_open = BeginViewportSideBar("##MainMenuBar", viewport, ImGuiDir_Up, height, window_flags);
g.NextWindowData.MenuBarOffsetMinVal = ImVec2(0.0f, 0.0f);
if (!is_open)
{
if (is_open)
BeginMenuBar();
else
End();
return false;
}
return true; //-V1020
return is_open;
}
void ImGui::EndMainMenuBar()