RenderManager class Core Rendering
Manages the rendering lifecycle of components onto a CanvasBuffer.
Tracks which ComponentInstances need to be redrawn (dirty components), handles clearing and redrawing their areas, and manages cursor position updates on the terminal screen.
Coordinates redraw requests efficiently by only rendering components marked as dirty, reducing unnecessary redraws.
Example
final buffer = CanvasBuffer(width: 80, height: 24);
final renderManager = RenderManager(buffer: buffer);
// Mark a component as dirty to trigger redraw
renderManager.markDirty(componentInstance);
// Request redraw of all dirty components
renderManager.requestRedraw();
// Move the cursor to position (10, 5)
renderManager.requestCursorMove(10, 5);
renderManager.render();
See Also
- CanvasBuffer: The drawing surface used by RenderManager.
- ComponentInstance: Represents UI components managed for rendering.
- AppInstance: Provides app-level flags like
shouldRebuild.
Constructors
- RenderManager({required CanvasBuffer buffer})
-
Creates a RenderManager for the given
buffer.
Properties
- buffer → CanvasBuffer
-
The canvas buffer onto which components are drawn.
final
- hasDirtyComponents → bool
-
Whether there are any dirty components queued for redraw.
no setter
- hashCode → int
-
The hash code for this object.
no setterinherited
- needsRecompute ↔ bool
-
Indicates if a full recompute of layout and rendering is needed.
getter/setter pair
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
clear(
) → void - Clears the list of dirty components, effectively cancelling redraw requests.
-
markDirty(
ComponentInstance comp) → void -
Marks the given
compas dirty, scheduling it for redraw. -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
recalculateScreen(
) → void - Placeholder to recalculate screen layout or state if needed.
-
render(
) → void - Renders the buffer to the terminal and moves/shows the cursor if requested.
-
requestCursorMove(
int x, int y) → void - Requests the cursor be moved to coordinates (x, y) on next render.
-
requestRecompute(
Rect bounds) → void -
Requests a full recompute/redraw of the screen inside
bounds. -
requestRedraw(
) → void - Requests a redraw of all dirty components.
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited