ui/eg/windows/main.go

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package main
import (
"fmt"
"os"
"git.kirsle.net/go/render"
"git.kirsle.net/go/render/event"
"git.kirsle.net/go/render/sdl"
"git.kirsle.net/go/ui"
)
// Program globals.
var (
// Size of the MainWindow.
Width = 1024
Height = 768
// Cascade offset for creating multiple windows.
Cascade = render.NewPoint(10, 32)
CascadeStep = render.NewPoint(24, 24)
CascadeLoops = 1
// Colors for each window created.
WindowColors = []render.Color{
render.Blue,
render.Red,
render.DarkYellow,
render.DarkGreen,
render.DarkCyan,
render.DarkBlue,
render.DarkRed,
}
WindowID int
OpenWindows int
)
func init() {
sdl.DefaultFontFilename = "../DejaVuSans.ttf"
}
func main() {
mw, err := ui.NewMainWindow("Hello World", Width, Height)
if err != nil {
panic(err)
}
// Menu bar.
menu := ui.NewMenuBar("Main Menu")
file := menu.AddMenu("Options")
file.AddItem("New window", func() {
addWindow(mw)
})
file.AddItem("Close all windows", func() {
OpenWindows -= mw.Supervisor().CloseAllWindows()
})
menu.Supervise(mw.Supervisor())
menu.Compute(mw.Engine)
mw.Pack(menu, menu.PackTop())
// Add some windows to play with.
addWindow(mw)
addWindow(mw)
mw.SetBackground(render.White)
mw.OnLoop(func(e *event.State) {
if e.Escape {
os.Exit(0)
}
})
mw.MainLoop()
}
// Add a new child window.
func addWindow(mw *ui.MainWindow) {
var (
color = WindowColors[WindowID%len(WindowColors)]
title = fmt.Sprintf("Window %d", WindowID+1)
)
WindowID++
win1 := ui.NewWindow(title)
win1.SetButtons(ui.CloseButton)
win1.ActiveTitleBackground = color
win1.InactiveTitleBackground = color.Darken(60)
win1.InactiveTitleForeground = render.Grey
win1.Configure(ui.Config{
Width: 320,
Height: 240,
})
win1.Compute(mw.Engine)
win1.Supervise(mw.Supervisor())
// Re-open a window when the last one is closed.
OpenWindows++
win1.Handle(ui.CloseWindow, func(ed ui.EventData) error {
OpenWindows--
if OpenWindows <= 0 {
addWindow(mw)
}
return nil
})
// Default placement via cascade.
win1.MoveTo(Cascade)
Cascade.Add(CascadeStep)
if Cascade.Y > Height-240-64 {
CascadeLoops++
Cascade.Y = 32
Cascade.X = 24 * CascadeLoops
}
// Add a window duplicator button.
btn2 := ui.NewButton(title+":Button2", ui.NewLabel(ui.Label{
Text: "New Window",
}))
btn2.Handle(ui.Click, func(ed ui.EventData) error {
addWindow(mw)
return nil
})
mw.Add(btn2)
win1.Place(btn2, ui.Place{
Top: 10,
Right: 10,
})
}