mirror of
https://git.sr.ht/~eliasnaur/gio
synced 2026-07-01 15:45:38 +00:00
Elias Naur
47c5859d87
We are going to encourage a model where pointers to a central (program global) Configs are passed to widgets at setup time, and not pass Configs at every frame. That way, the global Gonfig can change, but the pointers won't need updating. This change only switches the Draw event's Config pointer to a value to avoid tempting programs to use the event Config instead of updating their own central Configs. Signed-off-by: Elias Naur <mail@eliasnaur.com>
121 lines
2.3 KiB
Go
121 lines
2.3 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package app
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import (
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"image"
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"os"
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"strings"
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"gioui.org/ui"
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)
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type Event interface {
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ImplementsEvent()
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}
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type Draw struct {
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Config ui.Config
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Size image.Point
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// Whether this draw is system generated
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// and needs a complete frame before
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// proceeding.
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sync bool
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}
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type ChangeStage struct {
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Stage Stage
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}
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// Command is a system event.
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type Command 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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type Stage uint8
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type CommandType uint8
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type Input interface {
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ImplementsInput()
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}
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const (
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StageDead Stage = iota
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StagePaused
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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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const (
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inchPrDp = 1.0 / 160
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mmPrDp = 25.4 / 160
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// monitorScale is the extra scale applied to
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// monitor outputs to compensate for the extra
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// viewing distance compared to phone and tables.
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monitorScale = 1.50
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// minDensity is the minimum pixels per dp to
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// ensure font and ui legibility on low-dpi
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// screens.
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minDensity = 1.25
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)
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// extraArgs contains extra arguments to append to
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// os.Args. The arguments are separated with |.
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// Useful for running programs on mobiles where the
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// command line is not available.
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// Set it with the go tool linker flag -X.
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var extraArgs string
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var windows = make(chan *Window)
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// CreateWindow creates a new window for a set of window
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// options. The options are hints; the platform is free to
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// ignore or adjust them.
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// CreateWindow is not supported on iOS and Android.
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func CreateWindow(opts *WindowOptions) error {
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if opts == nil {
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opts = &WindowOptions{
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Width: ui.Dp(800),
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Height: ui.Dp(600),
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Title: "Gio program",
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}
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}
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if opts.Width.V <= 0 || opts.Height.V <= 0 {
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panic("window width and height must be larger than 0")
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}
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return createWindow(opts)
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}
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func Windows() <-chan *Window {
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return windows
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}
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func (l Stage) String() string {
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switch l {
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case StageDead:
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return "StageDead"
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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 (_ Draw) ImplementsEvent() {}
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func (_ ChangeStage) ImplementsEvent() {}
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func (_ *Command) ImplementsEvent() {}
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func init() {
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args := strings.Split(extraArgs, "|")
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os.Args = append(os.Args, args...)
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}
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