CanvasScrollbars.h File Reference

Geometry for the render pane's emulated canvas scrollbars. The canvas pane never window-scrolls (an ImGui window scrollbar would move the in-pane overlay chrome - toolbar, perf HUD - instead of the document), so the pane draws its own scrollbars that represent the document extent relative to the viewport and pan the canvas when dragged. More...

#include "donner/editor/ViewportState.h"

Include dependency graph for CanvasScrollbars.h:

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Classes
struct	donner::editor::CanvasScrollbarAxis
	One scrollbar axis of the render pane's emulated canvas scrollbars. More...
struct	donner::editor::CanvasScrollbars
	Both axes of the render pane's emulated canvas scrollbars. More...

Namespaces
namespace	donner
	Top-level Donner namespace, which is split into different sub-namespaces such as donner::svg and donner::css.

Functions
bool	donner::editor::CanvasScrollbarsContain (const ViewportState &viewport, const Vector2d &screenPoint)
	True when screenPoint lies on a visible scrollbar rail for viewport. Canvas tools must ignore pointer input over the rails so scrollbar drags never become canvas clicks or element drags.
CanvasScrollbars	donner::editor::ComputeCanvasScrollbars (const ViewportState &viewport)
	Compute the emulated scrollbar geometry for viewport. The scrollable content extent on each axis is the union of the document's screen-space box and the pane, matching the usual scroll-region contract (scrolling can always bring the viewport back to the document).

Variables
constexpr double	donner::editor::kCanvasScrollbarMinThumbPx = 24.0
	Minimum thumb length in logical pixels so the thumb stays grabbable at extreme zoom.
constexpr double	donner::editor::kCanvasScrollbarRailPx = 10.0
	Rail thickness in logical pixels (drawn along the pane bottom/right edges).

Detailed Description

Geometry for the render pane's emulated canvas scrollbars. The canvas pane never window-scrolls (an ImGui window scrollbar would move the in-pane overlay chrome - toolbar, perf HUD - instead of the document), so the pane draws its own scrollbars that represent the document extent relative to the viewport and pan the canvas when dragged.