// Copyright 2015 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'package:flutter/foundation.dart'; import 'package:flutter/painting.dart'; import 'object.dart'; export 'package:flutter/foundation.dart' show debugPrint; // Any changes to this file should be reflected in the debugAssertAllRenderVarsUnset() // function below. const HSVColor _kDebugDefaultRepaintColor = HSVColor.fromAHSV(0.4, 60.0, 1.0, 1.0); /// Causes each RenderBox to paint a box around its bounds, and some extra /// boxes, such as [RenderPadding], to draw construction lines. /// /// The edges of the boxes are painted as a one-pixel-thick `const Color(0xFF00FFFF)` outline. /// /// Spacing is painted as a solid `const Color(0x90909090)` area. /// /// Padding is filled in solid `const Color(0x900090FF)`, with the inner edge /// outlined in `const Color(0xFF0090FF)`, using [debugPaintPadding]. bool debugPaintSizeEnabled = false; /// Causes each RenderBox to paint a line at each of its baselines. bool debugPaintBaselinesEnabled = false; /// Causes each Layer to paint a box around its bounds. bool debugPaintLayerBordersEnabled = false; /// Causes objects like [RenderPointerListener] to flash while they are being /// tapped. This can be useful to see how large the hit box is, e.g. when /// debugging buttons that are harder to hit than expected. /// /// For details on how to support this in your [RenderBox] subclass, see /// [RenderBox.debugHandleEvent]. bool debugPaintPointersEnabled = false; /// Overlay a rotating set of colors when repainting layers in checked mode. /// /// See also: /// /// * [RepaintBoundary], which can be used to contain repaints when unchanged /// areas are being excessively repainted. bool debugRepaintRainbowEnabled = false; /// Overlay a rotating set of colors when repainting text in checked mode. bool debugRepaintTextRainbowEnabled = false; /// The current color to overlay when repainting a layer. /// /// This is used by painting debug code that implements /// [debugRepaintRainbowEnabled] or [debugRepaintTextRainbowEnabled]. /// /// The value is incremented by [RenderView.compositeFrame] if either of those /// flags is enabled. HSVColor debugCurrentRepaintColor = _kDebugDefaultRepaintColor; /// Log the call stacks that mark render objects as needing layout. /// /// For sanity, this only logs the stack traces of cases where an object is /// added to the list of nodes needing layout. This avoids printing multiple /// redundant stack traces as a single [RenderObject.markNeedsLayout] call walks /// up the tree. bool debugPrintMarkNeedsLayoutStacks = false; /// Log the call stacks that mark render objects as needing paint. bool debugPrintMarkNeedsPaintStacks = false; /// Log the dirty render objects that are laid out each frame. /// /// Combined with [debugPrintBeginFrameBanner], this allows you to distinguish /// layouts triggered by the initial mounting of a render tree (e.g. in a call /// to [runApp]) from the regular layouts triggered by the pipeline. /// /// Combined with [debugPrintMarkNeedsLayoutStacks], this lets you watch a /// render object's dirty/clean lifecycle. /// /// See also: /// /// * [debugProfilePaintsEnabled], which does something similar for /// painting but using the timeline view. /// /// * [debugPrintRebuildDirtyWidgets], which does something similar for widgets /// being rebuilt. /// /// * The discussion at [RendererBinding.drawFrame]. bool debugPrintLayouts = false; /// Check the intrinsic sizes of each [RenderBox] during layout. /// /// By default this is turned off since these checks are expensive, but it is /// enabled by the test framework. bool debugCheckIntrinsicSizes = false; /// Adds [dart:developer.Timeline] events for every [RenderObject] painted. /// /// This is only enabled in debug builds. The timing information this exposes is /// not representative of actual paints. However, it can expose unexpected /// painting in the timeline. /// /// For details on how to use [dart:developer.Timeline] events in the Dart /// Observatory to optimize your app, see: /// <https://fuchsia.googlesource.com/sysui/+/master/docs/performance.md> /// /// See also: /// /// * [debugPrintLayouts], which does something similar for layout but using /// console output. /// * [debugProfileBuildsEnabled], which does something similar for widgets /// being rebuilt, and [debugPrintRebuildDirtyWidgets], its console /// equivalent. /// * The discussion at [RendererBinding.drawFrame]. /// * [RepaintBoundary], which can be used to contain repaints when unchanged /// areas are being excessively repainted. bool debugProfilePaintsEnabled = false; /// Signature for [debugOnProfilePaint] implementations. typedef ProfilePaintCallback = void Function(RenderObject renderObject); /// Callback invoked for every [RenderObject] painted each frame. /// /// This callback is only invoked in debug builds. /// /// See also: /// /// * [debugProfilePaintsEnabled], which does something similar but adds /// [dart:developer.Timeline] events instead of invoking a callback. /// * [debugOnRebuildDirtyWidget], which does something similar for widgets /// being built. /// * [WidgetInspectorService], which uses the [debugOnProfilePaint] /// callback to generate aggregate profile statistics describing what paints /// occurred when the `ext.flutter.inspector.trackRepaintWidgets` service /// extension is enabled. ProfilePaintCallback debugOnProfilePaint; /// Setting to true will cause all clipping effects from the layer tree to be /// ignored. /// /// Can be used to debug whether objects being clipped are painting excessively /// in clipped areas. Can also be used to check whether excessive use of /// clipping is affecting performance. /// /// This will not reduce the number of [Layer] objects created; the compositing /// strategy is unaffected. It merely causes the clipping layers to be skipped /// when building the scene. bool debugDisableClipLayers = false; /// Setting to true will cause all physical modeling effects from the layer /// tree, such as shadows from elevations, to be ignored. /// /// Can be used to check whether excessive use of physical models is affecting /// performance. /// /// This will not reduce the number of [Layer] objects created; the compositing /// strategy is unaffected. It merely causes the physical shape layers to be /// skipped when building the scene. bool debugDisablePhysicalShapeLayers = false; /// Setting to true will cause all opacity effects from the layer tree to be /// ignored. /// /// An optimization to not paint the child at all when opacity is 0 will still /// remain. /// /// Can be used to check whether excessive use of opacity effects is affecting /// performance. /// /// This will not reduce the number of [Layer] objects created; the compositing /// strategy is unaffected. It merely causes the opacity layers to be skipped /// when building the scene. bool debugDisableOpacityLayers = false; void _debugDrawDoubleRect(Canvas canvas, Rect outerRect, Rect innerRect, Color color) { final Path path = Path() ..fillType = PathFillType.evenOdd ..addRect(outerRect) ..addRect(innerRect); final Paint paint = Paint() ..color = color; canvas.drawPath(path, paint); } /// Paint a diagram showing the given area as padding. /// /// Called by [RenderPadding.debugPaintSize] when [debugPaintSizeEnabled] is /// true. void debugPaintPadding(Canvas canvas, Rect outerRect, Rect innerRect, { double outlineWidth = 2.0 }) { assert(() { if (innerRect != null && !innerRect.isEmpty) { _debugDrawDoubleRect(canvas, outerRect, innerRect, const Color(0x900090FF)); _debugDrawDoubleRect(canvas, innerRect.inflate(outlineWidth).intersect(outerRect), innerRect, const Color(0xFF0090FF)); } else { final Paint paint = Paint() ..color = const Color(0x90909090); canvas.drawRect(outerRect, paint); } return true; }()); } /// Returns true if none of the rendering library debug variables have been changed. /// /// This function is used by the test framework to ensure that debug variables /// haven't been inadvertently changed. /// /// See <https://docs.flutter.io/flutter/rendering/rendering-library.html> for /// a complete list. /// /// The `debugCheckIntrinsicSizesOverride` argument can be provided to override /// the expected value for [debugCheckIntrinsicSizes]. (This exists because the /// test framework itself overrides this value in some cases.) bool debugAssertAllRenderVarsUnset(String reason, { bool debugCheckIntrinsicSizesOverride = false }) { assert(() { if (debugPaintSizeEnabled || debugPaintBaselinesEnabled || debugPaintLayerBordersEnabled || debugPaintPointersEnabled || debugRepaintRainbowEnabled || debugRepaintTextRainbowEnabled || debugCurrentRepaintColor != _kDebugDefaultRepaintColor || debugPrintMarkNeedsLayoutStacks || debugPrintMarkNeedsPaintStacks || debugPrintLayouts || debugCheckIntrinsicSizes != debugCheckIntrinsicSizesOverride || debugProfilePaintsEnabled || debugOnProfilePaint != null) { throw FlutterError(reason); } return true; }()); return true; }