FrameTiming class Null safety
Time-related performance metrics of a frame.
If you're using the whole Flutter framework, please use SchedulerBinding.addTimingsCallback to get this. It's preferred over using PlatformDispatcher.onReportTimings directly because SchedulerBinding.addTimingsCallback allows multiple callbacks. If SchedulerBinding is unavailable, then see PlatformDispatcher.onReportTimings for how to get this.
The metrics in debug mode (flutter run without any flags) may be very
different from those in profile and release modes due to the debug overhead.
Therefore it's recommended to only monitor and analyze performance metrics
in profile and release modes.
Constructors
- FrameTiming({required int vsyncStart, required int buildStart, required int buildFinish, required int rasterStart, required int rasterFinish, required int rasterFinishWallTime, int layerCacheCount = 0, int layerCacheBytes = 0, int pictureCacheCount = 0, int pictureCacheBytes = 0, int frameNumber = -1})
-
Construct FrameTiming with raw timestamps in microseconds.
factory
Properties
- buildDuration → Duration
-
The duration to build the frame on the UI thread.
read-only
- frameNumber → int
-
The frame key associated with this frame measurement.
read-only
- hashCode → int
-
The hash code for this object.
read-onlyinherited
- layerCacheBytes → int
-
The number of bytes of image data used to cache layers during the frame.
read-only
- layerCacheCount → int
-
The number of layers stored in the raster cache during the frame.
read-only
- layerCacheMegabytes → double
-
The number of megabytes of image data used to cache layers during the frame.
read-only
- pictureCacheBytes → int
-
The number of bytes of image data used to cache pictures during the frame.
read-only
- pictureCacheCount → int
-
The number of pictures stored in the raster cache during the frame.
read-only
- pictureCacheMegabytes → double
-
The number of megabytes of image data used to cache pictures during the frame.
read-only
- rasterDuration → Duration
-
The duration to rasterize the frame on the raster thread.
read-only
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
- totalSpan → Duration
-
The timespan between vsync start and raster finish.
read-only
- vsyncOverhead → Duration
-
The duration between receiving the vsync signal and starting building the
frame.
read-only
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited
-
timestampInMicroseconds(
FramePhase phase) → int - This is a raw timestamp in microseconds from some epoch. The epoch in all FrameTiming is the same, but it may not match DateTime's epoch.
-
toString(
) → String -
A string representation of this object.
override
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited