forked from joejulian/gio
Elias Naur
103 lines
2.2 KiB
Go
103 lines
2.2 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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// Package system contains events usually handled at the top-level
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// program level.
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package system
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import (
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"image"
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"time"
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"gioui.org/op"
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"gioui.org/unit"
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)
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// A FrameEvent asks for a new frame in the form of a list of
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// operations.
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type FrameEvent struct {
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Config Config
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// Size is the dimensions of the window.
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Size image.Point
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// Insets is the insets to apply.
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Insets Insets
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// Frame replaces the window's frame with the new
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// frame.
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Frame func(frame *op.Ops)
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// Whether this draw is system generated and needs a complete
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// frame before proceeding.
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sync bool
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}
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// Config defines the essential properties of
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// the environment.
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type Config interface {
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// Now returns the current animation time.
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Now() time.Time
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unit.Converter
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}
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// DestroyEvent is the last event sent through
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// a window event channel.
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type DestroyEvent struct {
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// Err is nil for normal window closures. If a
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// window is prematurely closed, Err is the cause.
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Err error
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}
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// Insets is the space taken up by
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// system decoration such as translucent
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// system bars and software keyboards.
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type Insets struct {
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Top, Bottom, Left, Right unit.Value
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}
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// A StageEvent is generated whenever the stage of a
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// Window changes.
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type StageEvent struct {
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Stage Stage
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}
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// CommandEvent is a system event.
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type CommandEvent struct {
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Type CommandType
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// Suppress the default action of the command.
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Cancel bool
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}
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// Stage of a Window.
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type Stage uint8
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// CommandType is the type of a CommandEvent.
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type CommandType uint8
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const (
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// StagePaused is the Stage for inactive Windows.
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// Inactive Windows don't receive FrameEvents.
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StagePaused Stage = iota
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// StateRunning is for active Windows.
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StageRunning
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)
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const (
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// CommandBack is the command for a back action
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// such as the Android back button.
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CommandBack CommandType = iota
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)
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func (l Stage) String() string {
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switch l {
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case StagePaused:
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return "StagePaused"
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case StageRunning:
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return "StageRunning"
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default:
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panic("unexpected Stage value")
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}
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}
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func (_ FrameEvent) ImplementsEvent() {}
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func (_ StageEvent) ImplementsEvent() {}
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func (_ *CommandEvent) ImplementsEvent() {}
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func (_ DestroyEvent) ImplementsEvent() {}
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