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app,io/system,layout: [API] move FrameEvent and Insets to package app

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In the early days of Gio, FrameEvent was part of package app. It was
moved to package system to enable layout.NewContext be a convenient
short-hand for constructing a layout.

However, it seems the better design to leave FrameEvent (and Insets) in
package app, and move layout.NewContext there as well. More importantly,
the move allows us to replace the event.Queue interface with a concrete
type.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2023-10-08 12:21:41 -05:00
parent 60bfb9e064
commit cb1e605203
16 changed files with 103 additions and 107 deletions
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io/system/system.go
+3 -41
View File
@@ -4,35 +4,6 @@
// program level.
package system
import (
"image"
"time"
"gioui.org/io/event"
"gioui.org/op"
"gioui.org/unit"
)
// A FrameEvent requests a new frame in the form of a list of
// operations that describes what to display and how to handle
// input.
type FrameEvent struct {
// Now is the current animation. Use Now instead of time.Now to
// synchronize animation and to avoid the time.Now call overhead.
Now time.Time
// Metric converts device independent dp and sp to device pixels.
Metric unit.Metric
// Size is the dimensions of the window.
Size image.Point
// Insets represent the space occupied by system decorations and controls.
Insets Insets
// Frame completes the FrameEvent by drawing the graphical operations
// from ops into the window.
Frame func(frame *op.Ops)
// Queue supplies the events for event handlers.
Queue event.Queue
}
// DestroyEvent is the last event sent through
// a window event channel.
type DestroyEvent struct {
@@ -41,14 +12,6 @@ type DestroyEvent struct {
Err error
}
// Insets is the space taken up by
// system decoration such as translucent
// system bars and software keyboards.
type Insets struct {
// Values are in pixels.
Top, Bottom, Left, Right unit.Dp
}
// A StageEvent is generated whenever the stage of a
// Window changes.
type StageEvent struct {
@@ -60,13 +23,13 @@ type Stage uint8
const (
// StagePaused is the stage for windows that have no on-screen representation.
// Paused windows don't receive FrameEvent.
// Paused windows don't receive frames.
StagePaused Stage = iota
// StageInactive is the stage for windows that are visible, but not active.
// Inactive windows receive FrameEvent.
// Inactive windows receive frames.
StageInactive
// StageRunning is for active and visible Windows.
// Running windows receive FrameEvent.
// Running windows receive frames.
StageRunning
)
@@ -84,6 +47,5 @@ func (l Stage) String() string {
}
}
func (FrameEvent) ImplementsEvent() {}
func (StageEvent) ImplementsEvent() {}
func (DestroyEvent) ImplementsEvent() {}