RenderPaneGesture.h File Reference

Headless classification for render-pane scroll gestures. main.cc feeds raw GLFW scroll events into this helper so tests can cover pan vs. zoom routing without depending on ImGui or GLFW. More...

#include <optional>
#include "donner/base/Box.h"
#include "donner/base/Vector2.h"
#include "donner/editor/ViewportState.h"

Include dependency graph for RenderPaneGesture.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	donner::editor::RenderPaneScrollEvent
	Raw scroll event captured from the windowing layer. More...
struct	donner::editor::RenderPaneGestureContext
	Per-frame state needed to route a raw scroll event. More...
struct	donner::editor::RenderPaneGestureAction
	Output of ClassifyRenderPaneScrollGesture. More...

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

Enumerations
enum class	donner::editor::RenderPaneGestureActionType {   Pan ,   Zoom }
	The viewport mutation a scroll gesture should apply.

Functions
std::optional< RenderPaneGestureAction >	donner::editor::ClassifyRenderPaneScrollGesture (const RenderPaneScrollEvent &event, const RenderPaneGestureContext &context, double wheelZoomStep, double panPixelsPerScrollUnit)
	Route a raw scroll event to either pan or zoom.
void	donner::editor::ApplyRenderPaneGesture (ViewportState &viewport, const RenderPaneGestureAction &action)
	Apply a classified gesture action to the viewport.

Detailed Description

Headless classification for render-pane scroll gestures. main.cc feeds raw GLFW scroll events into this helper so tests can cover pan vs. zoom routing without depending on ImGui or GLFW.

Function Documentation

ApplyRenderPaneGesture()

void donner::editor::ApplyRenderPaneGesture	(	ViewportState &	viewport,
		const RenderPaneGestureAction &	action )

Apply a classified gesture action to the viewport.

Parameters

viewport	Viewport state to mutate.
action	Gesture action previously returned by ClassifyRenderPaneScrollGesture.

ClassifyRenderPaneScrollGesture()

std::optional< RenderPaneGestureAction > donner::editor::ClassifyRenderPaneScrollGesture ( const RenderPaneScrollEvent & event, const RenderPaneGestureContext & context, double wheelZoomStep, double panPixelsPerScrollUnit )

nodiscard

Route a raw scroll event to either pan or zoom.

Bare scroll inside the pane pans. Cmd/Ctrl-modified vertical scroll zooms around the cursor using the existing wheel-zoom step model. Events outside the pane, zero-delta events, and wheel input while a mouse-drag pan is active are ignored.

Parameters

event	Raw scroll event from GLFW.
context	Per-frame pane bounds and mouse-pan state.
wheelZoomStep	Multiplicative zoom step per +1.0 wheel unit.
panPixelsPerScrollUnit	Screen pixels to pan per +1.0 scroll unit.

Returns

The viewport mutation to apply, if any.