func main() {
X, err := xgbutil.NewConn()
if err != nil {
log.Fatal(err)
}
// Load some font. You may need to change the path depending upon your
// system configuration.
fontReader, err := os.Open(fontPath)
if err != nil {
log.Fatal(err)
}
// Now parse the font.
font, err := xgraphics.ParseFont(fontReader)
if err != nil {
log.Fatal(err)
}
// Create some canvas.
ximg := xgraphics.New(X, image.Rect(0, 0, canvasWidth, canvasHeight))
ximg.For(func(x, y int) xgraphics.BGRA {
return bg
})
// Now write the text.
_, _, err = ximg.Text(10, 10, fg, size, font, msg)
if err != nil {
log.Fatal(err)
}
// Compute extents of first line of text.
_, firsth := xgraphics.Extents(font, size, msg)
// Now show the image in its own window.
win := ximg.XShowExtra("Drawing text using xgraphics", true)
// Now draw some more text below the above and demonstrate how to update
// only the region we've updated.
_, _, err = ximg.Text(10, 10+firsth, fg, size, font, "Some more text.")
if err != nil {
log.Fatal(err)
}
// Now compute extents of the second line of text, so we know which region
// to update.
secw, sech := xgraphics.Extents(font, size, "Some more text.")
// Now repaint on the region that we drew text on. Then update the screen.
bounds := image.Rect(10, 10+firsth, 10+secw, 10+firsth+sech)
ximg.SubImage(bounds).XDraw()
ximg.XPaint(win.Id)
// All we really need to do is block, which could be achieved using
// 'select{}'. Invoking the main event loop however, will emit error
// message if anything went seriously wrong above.
xevent.Main(X)
}
// NewInput constructs Input values. It needs an X connection, a parent window,
// the width of the input box, and theme information related for the font
// and background. Padding separating the text and the edges of the window
// may also be specified.
//
// While NewInput returns an *Input, a Input value also has an xwindow.Window
// value embedded into it. Thus, an Input can also be treated as a normal
// window on which you can assign callbacks, close, destroy, etc.
//
// As with all windows, the Input window should be destroyed when it is no
// longer in used.
func NewInput(X *xgbutil.XUtil, parent xproto.Window, width int, padding int,
font *truetype.Font, fontSize float64,
fontColor, bgColor render.Color) *Input {
_, height := xgraphics.Extents(font, fontSize, "M")
width, height = width+2*padding, height+2*padding
img := xgraphics.New(X, image.Rect(0, 0, width, height))
win := xwindow.Must(xwindow.Create(X, parent))
win.Listen(xproto.EventMaskKeyPress)
win.Resize(width, height)
ti := &Input{
Window: win,
img: img,
Text: make([]rune, 0, 50),
font: font,
fontSize: fontSize,
fontColor: fontColor,
bgColor: bgColor,
padding: padding,
}
ti.Render()
return ti
}
// DrawText is a convenience function that will create a new image, render
// the provided text to it, paint the image to the provided window, and resize
// the window to fit the text snugly.
//
// An error can occur when rendering the text to an image.
func DrawText(win *xwindow.Window, font *truetype.Font, size float64,
fontClr, bgClr render.Color, text string) error {
// BUG(burntsushi): If `text` is zero-length, very bad things happen.
if len(text) == 0 {
text = " "
}
// Over estimate the extents.
ew, eh := xgraphics.Extents(font, size, text)
// Create an image using the over estimated extents.
img := xgraphics.New(win.X, image.Rect(0, 0, ew, eh))
xgraphics.BlendBgColor(img, bgClr.ImageColor())
// Now draw the text, grab the (x, y) position advanced by the text, and
// check for an error in rendering.
_, _, err := img.Text(0, 0, fontClr.ImageColor(), size, font, text)
if err != nil {
return err
}
// Resize the window to the geometry determined by (x, y).
win.Resize(ew, eh)
// Now draw the image to the window and destroy it.
img.XSurfaceSet(win.Id)
// subimg := img.SubImage(image.Rect(0, 0, ew, eh))
img.XDraw()
img.XPaint(win.Id)
img.Destroy()
return nil
}
// NewCycle creates a new prompt. As many prompts as you want can be created,
// and they could even technically be shown simultaneously so long as at most
// one of them is using a grab. (The grab will fail for the others and they
// will not be shown.)
//
// CycleTheme and CycleConfig values can either use DefaultCycle{Theme,Config}
// values found in this package, or custom ones can be created using
// composite literals.
func NewCycle(X *xgbutil.XUtil, theme *CycleTheme, config CycleConfig) *Cycle {
cycle := &Cycle{
X: X,
theme: theme,
config: config,
showing: false,
selected: -1,
grabMods: 0,
}
// Create all windows used for the base of the cycle prompt.
// This obviously doesn't include the windows representing the items.
cwin := func(p xproto.Window) *xwindow.Window {
return xwindow.Must(xwindow.Create(X, p))
}
cycle.win = cwin(X.RootWin())
cycle.bTop, cycle.bBot = cwin(cycle.win.Id), cwin(cycle.win.Id)
cycle.bLft, cycle.bRht = cwin(cycle.win.Id), cwin(cycle.win.Id)
// Make the top-level window override redirect so the window manager
// doesn't mess with us.
cycle.win.Change(xproto.CwOverrideRedirect, 1)
// Set the colors of each window.
cclr := func(w *xwindow.Window, clr render.Color) {
w.Change(xproto.CwBackPixel, uint32(clr.Int()))
}
cclr(cycle.win, cycle.theme.BgColor)
cclr(cycle.bTop, cycle.theme.BorderColor)
cclr(cycle.bBot, cycle.theme.BorderColor)
cclr(cycle.bLft, cycle.theme.BorderColor)
cclr(cycle.bRht, cycle.theme.BorderColor)
// Map the sub-windows once. (Real mapping only happens when
// cycle.win is mapped.)
cycle.bTop.Map()
cycle.bBot.Map()
cycle.bLft.Map()
cycle.bRht.Map()
// Connect the key response handler (i.e., the alt-tab'ing, canceling, etc.)
cycle.keyResponse().Connect(X, X.Dummy())
// Guess the maximum font height.
_, cycle.fontHeight = xgraphics.Extents(
cycle.theme.Font, cycle.theme.FontSize, "A")
return cycle
}
func (c *Clock) Draw() {
c.img.For(func(x, y int) xgraphics.BGRA {
return c.Background
})
now := time.Now().Format(c.Format)
w, h := xgraphics.Extents(c.Font, c.FontSize, now)
//println("OH MYYYY: ", w, h)
c.img.Text((c.Width/2)-(w/2), (c.Height/2)-(h/2), c.Foreground, c.FontSize, c.Font, now)
c.img.XDraw()
c.img.XPaint(c.window.Id)
}
func (f *Full) UpdateTitle() {
if f == nil {
return
}
title := f.client.Name()
font := f.theme.Font
fontSize := f.theme.FontSize
aFontColor := f.theme.AFontColor.ImageColor()
iFontColor := f.theme.IFontColor.ImageColor()
ew, eh := xgraphics.Extents(font, fontSize, title)
imgA := render.NewBorder(f.X, 0, render.NoColor, f.theme.ATitleColor,
ew, f.theme.TitleSize,
render.GradientVert, render.GradientRegular)
imgI := render.NewBorder(f.X, 0, render.NoColor, f.theme.ITitleColor,
ew, f.theme.TitleSize,
render.GradientVert, render.GradientRegular)
y := (f.theme.TitleSize - eh) / 2
_, _, err := imgA.Text(0, y, aFontColor, fontSize, font, title)
if err != nil {
logger.Warning.Printf("Could not draw window title for window %s "+
"because: %v", f.client, err)
}
_, _, err = imgI.Text(0, y, iFontColor, fontSize, font, title)
if err != nil {
logger.Warning.Printf("Could not draw window title for window %s "+
"because: %v", f.client, err)
}
width, height := ew, imgA.Bounds().Max.Y
f.titleText.Create(
imgA.SubImage(image.Rect(0, 0, width, height)),
imgI.SubImage(image.Rect(0, 0, width, height)))
f.titleText.MROpt(fW, 0, 0, width, 0)
if f.client.State() == Active {
f.titleText.Active()
} else {
f.titleText.Inactive()
}
}
func (i *Item) update(text string) {
if text == i.displayed {
return
} else if i.displayed == "" {
i.displayed = text
}
width, height := xgraphics.Extents(i.TrueType, i.Size, i.displayed)
sub := i.image.SubImage(image.Rect(10, i.offset, 10+width, height+i.offset))
sub.ForExp(func(x, y int) (r, b, g, a uint8) {
return 0x00, 0x00, 0x00, 0x00
})
sub.Text(10, i.offset, i.Color, i.Size, i.TrueType, text)
sub.XDraw()
sub.XExpPaint(i.window.Id, 10, i.offset)
i.displayed = text
}