361 lines
9.1 KiB
Go
361 lines
9.1 KiB
Go
package x
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import "image"
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import "github.com/jezek/xgb/xproto"
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import "github.com/jezek/xgbutil/ewmh"
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import "github.com/jezek/xgbutil/icccm"
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import "github.com/jezek/xgbutil/xevent"
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import "github.com/jezek/xgbutil/xwindow"
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import "github.com/jezek/xgbutil/xgraphics"
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import "git.tebibyte.media/sashakoshka/tomo/input"
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import "git.tebibyte.media/sashakoshka/tomo/theme"
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import "git.tebibyte.media/sashakoshka/tomo/config"
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import "git.tebibyte.media/sashakoshka/tomo/canvas"
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import "git.tebibyte.media/sashakoshka/tomo/elements"
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type Window struct {
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backend *Backend
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xWindow *xwindow.Window
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xCanvas *xgraphics.Image
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canvas canvas.BasicCanvas
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child elements.Element
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onClose func ()
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skipChildDrawCallback bool
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theme theme.Theme
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config config.Config
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metrics struct {
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width int
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height int
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}
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}
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func (backend *Backend) NewWindow (
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width, height int,
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) (
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output elements.Window,
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err error,
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) {
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if backend == nil { panic("nil backend") }
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window := &Window { backend: backend }
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window.xWindow, err = xwindow.Generate(backend.connection)
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if err != nil { return }
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window.xWindow.Create (
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backend.connection.RootWin(),
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0, 0, width, height, 0)
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err = window.xWindow.Listen (
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xproto.EventMaskExposure,
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xproto.EventMaskStructureNotify,
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xproto.EventMaskPointerMotion,
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xproto.EventMaskKeyPress,
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xproto.EventMaskKeyRelease,
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xproto.EventMaskButtonPress,
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xproto.EventMaskButtonRelease)
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if err != nil { return }
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window.xWindow.WMGracefulClose (func (xWindow *xwindow.Window) {
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window.Close()
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})
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xevent.ExposeFun(window.handleExpose).
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Connect(backend.connection, window.xWindow.Id)
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xevent.ConfigureNotifyFun(window.handleConfigureNotify).
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Connect(backend.connection, window.xWindow.Id)
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xevent.KeyPressFun(window.handleKeyPress).
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Connect(backend.connection, window.xWindow.Id)
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xevent.KeyReleaseFun(window.handleKeyRelease).
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Connect(backend.connection, window.xWindow.Id)
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xevent.ButtonPressFun(window.handleButtonPress).
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Connect(backend.connection, window.xWindow.Id)
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xevent.ButtonReleaseFun(window.handleButtonRelease).
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Connect(backend.connection, window.xWindow.Id)
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xevent.MotionNotifyFun(window.handleMotionNotify).
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Connect(backend.connection, window.xWindow.Id)
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window.SetTheme(backend.theme)
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window.SetConfig(backend.config)
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window.metrics.width = width
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window.metrics.height = height
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window.childMinimumSizeChangeCallback(8, 8)
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window.reallocateCanvas()
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backend.windows[window.xWindow.Id] = window
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output = window
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return
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}
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func (window *Window) Adopt (child elements.Element) {
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// disown previous child
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if window.child != nil {
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window.child.OnDamage(nil)
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window.child.OnMinimumSizeChange(nil)
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}
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if previousChild, ok := window.child.(elements.Flexible); ok {
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previousChild.OnFlexibleHeightChange(nil)
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}
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if previousChild, ok := window.child.(elements.Focusable); ok {
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previousChild.OnFocusRequest(nil)
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previousChild.OnFocusMotionRequest(nil)
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if previousChild.Focused() {
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previousChild.HandleUnfocus()
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}
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}
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// adopt new child
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window.child = child
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if newChild, ok := child.(elements.Themeable); ok {
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newChild.SetTheme(window.theme)
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}
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if newChild, ok := child.(elements.Configurable); ok {
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newChild.SetConfig(window.config)
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}
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if newChild, ok := child.(elements.Flexible); ok {
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newChild.OnFlexibleHeightChange(window.resizeChildToFit)
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}
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if newChild, ok := child.(elements.Focusable); ok {
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newChild.OnFocusRequest(window.childSelectionRequestCallback)
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}
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if child != nil {
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child.OnDamage(window.childDrawCallback)
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child.OnMinimumSizeChange (func () {
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window.childMinimumSizeChangeCallback (
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child.MinimumSize())
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})
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if !window.childMinimumSizeChangeCallback(child.MinimumSize()) {
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window.resizeChildToFit()
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window.redrawChildEntirely()
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}
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}
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}
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func (window *Window) Child () (child elements.Element) {
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child = window.child
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return
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}
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func (window *Window) SetTitle (title string) {
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ewmh.WmNameSet (
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window.backend.connection,
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window.xWindow.Id,
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title)
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}
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func (window *Window) SetIcon (sizes []image.Image) {
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wmIcons := []ewmh.WmIcon { }
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for _, icon := range sizes {
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width := icon.Bounds().Max.X
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height := icon.Bounds().Max.Y
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wmIcon := ewmh.WmIcon {
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Width: uint(width),
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Height: uint(height),
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Data: make ([]uint, width * height),
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}
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// manually convert image data beacuse of course we have to do
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// this
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index := 0
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for y := 0; y < height; y ++ {
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for x := 0; x < width; x ++ {
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r, g, b, a := icon.At(x, y).RGBA()
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r >>= 8
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g >>= 8
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b >>= 8
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a >>= 8
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wmIcon.Data[index] =
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(uint(a) << 24) |
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(uint(r) << 16) |
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(uint(g) << 8) |
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(uint(b) << 0)
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index ++
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}}
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wmIcons = append(wmIcons, wmIcon)
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}
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ewmh.WmIconSet (
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window.backend.connection,
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window.xWindow.Id,
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wmIcons)
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}
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func (window *Window) Show () {
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if window.child == nil {
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window.xCanvas.For (func (x, y int) xgraphics.BGRA {
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return xgraphics.BGRA { }
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})
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window.pushRegion(window.xCanvas.Bounds())
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}
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window.xWindow.Map()
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}
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func (window *Window) Hide () {
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window.xWindow.Unmap()
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}
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func (window *Window) Close () {
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delete(window.backend.windows, window.xWindow.Id)
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if window.onClose != nil { window.onClose() }
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xevent.Detach(window.xWindow.X, window.xWindow.Id)
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window.xWindow.Destroy()
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}
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func (window *Window) OnClose (callback func ()) {
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window.onClose = callback
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}
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func (window *Window) SetTheme (theme theme.Theme) {
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window.theme = theme
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if child, ok := window.child.(elements.Themeable); ok {
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child.SetTheme(theme)
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}
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}
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func (window *Window) SetConfig (config config.Config) {
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window.config = config
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if child, ok := window.child.(elements.Configurable); ok {
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child.SetConfig(config)
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}
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}
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func (window *Window) reallocateCanvas () {
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window.canvas.Reallocate(window.metrics.width, window.metrics.height)
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previousWidth, previousHeight := 0, 0
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if window.xCanvas != nil {
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previousWidth = window.xCanvas.Bounds().Dx()
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previousHeight = window.xCanvas.Bounds().Dy()
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}
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newWidth := window.metrics.width
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newHeight := window.metrics.height
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larger := newWidth > previousWidth || newHeight > previousHeight
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smaller := newWidth < previousWidth / 2 || newHeight < previousHeight / 2
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if larger || smaller {
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if window.xCanvas != nil {
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window.xCanvas.Destroy()
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}
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window.xCanvas = xgraphics.New (
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window.backend.connection,
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image.Rect (
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0, 0,
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(newWidth / 64) * 64 + 64,
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(newHeight / 64) * 64 + 64))
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window.xCanvas.CreatePixmap()
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}
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}
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func (window *Window) redrawChildEntirely () {
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window.pushRegion(window.paste(window.canvas))
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}
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func (window *Window) resizeChildToFit () {
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window.skipChildDrawCallback = true
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if child, ok := window.child.(elements.Flexible); ok {
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minimumHeight := child.FlexibleHeightFor(window.metrics.width)
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minimumWidth, _ := child.MinimumSize()
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icccm.WmNormalHintsSet (
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window.backend.connection,
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window.xWindow.Id,
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&icccm.NormalHints {
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Flags: icccm.SizeHintPMinSize,
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MinWidth: uint(minimumWidth),
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MinHeight: uint(minimumHeight),
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})
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if window.metrics.height >= minimumHeight &&
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window.metrics.width >= minimumWidth {
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window.child.DrawTo(window.canvas)
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}
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} else {
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window.child.DrawTo(window.canvas)
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}
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window.skipChildDrawCallback = false
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}
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func (window *Window) childDrawCallback (region canvas.Canvas) {
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if window.skipChildDrawCallback { return }
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window.pushRegion(window.paste(region))
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}
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func (window *Window) paste (canvas canvas.Canvas) (updatedRegion image.Rectangle) {
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data, stride := canvas.Buffer()
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bounds := canvas.Bounds().Intersect(window.xCanvas.Bounds())
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for x := bounds.Min.X; x < bounds.Max.X; x ++ {
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for y := bounds.Min.Y; y < bounds.Max.Y; y ++ {
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rgba := data[x + y * stride]
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index := x * 4 + y * window.xCanvas.Stride
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window.xCanvas.Pix[index + 0] = rgba.B
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window.xCanvas.Pix[index + 1] = rgba.G
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window.xCanvas.Pix[index + 2] = rgba.R
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window.xCanvas.Pix[index + 3] = rgba.A
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}}
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return bounds
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}
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func (window *Window) childMinimumSizeChangeCallback (width, height int) (resized bool) {
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icccm.WmNormalHintsSet (
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window.backend.connection,
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window.xWindow.Id,
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&icccm.NormalHints {
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Flags: icccm.SizeHintPMinSize,
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MinWidth: uint(width),
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MinHeight: uint(height),
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})
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newWidth := window.metrics.width
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newHeight := window.metrics.height
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if newWidth < width { newWidth = width }
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if newHeight < height { newHeight = height }
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if newWidth != window.metrics.width ||
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newHeight != window.metrics.height {
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window.xWindow.Resize(newWidth, newHeight)
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return true
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}
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return false
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}
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func (window *Window) childSelectionRequestCallback () (granted bool) {
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if _, ok := window.child.(elements.Focusable); ok {
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return true
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}
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return false
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}
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func (window *Window) childSelectionMotionRequestCallback (
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direction input.KeynavDirection,
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) (
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granted bool,
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) {
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if child, ok := window.child.(elements.Focusable); ok {
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if !child.HandleFocus(direction) {
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child.HandleUnfocus()
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}
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return true
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}
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return true
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}
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func (window *Window) pushRegion (region image.Rectangle) {
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if window.xCanvas == nil { panic("whoopsie!!!!!!!!!!!!!!") }
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image, ok := window.xCanvas.SubImage(region).(*xgraphics.Image)
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if ok {
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image.XDraw()
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image.XExpPaint (
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window.xWindow.Id,
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image.Bounds().Min.X,
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image.Bounds().Min.Y)
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}
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}
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