func RedrawWindow(W *XWindow, tweetsList []*TweetInfo, mouseClick [2]int) {
var Attribs C.XWindowAttributes
C.XGetWindowAttributes(W.Display, W.Window, &Attribs)
// TODO -- Do this only when resizing?
C.cairo_xlib_surface_set_size(W.Surface, Attribs.width, Attribs.height)
C.cairo_set_source_rgb(W.Cairo, 0.1, 0.1, 0.1)
C.cairo_paint(W.Cairo)
var Rect C.PangoRectangle
yPos := 10.0 + W.Scroll
WindowWidth := Attribs.width
maxTweetWidth := PixelsToPango(float64(WindowWidth - 5*UIPadding - UserImageSize))
for i := 0; i < len(tweetsList); i++ {
t := tweetsList[i]
C.pango_layout_set_width(t.Layout, maxTweetWidth)
C.pango_layout_get_extents(t.Layout, nil, &Rect)
// Get tweet text size
_, ry, _, rh := PangoRectToPixels(&Rect)
// Position and add padding
ry += yPos
if rh < UserImageSize+2*UIPadding-UIPadding {
rh = UserImageSize + 2*UIPadding
} else {
rh += UIPadding
}
// Draw rectangle around tweet
C.cairo_set_source_rgb(W.Cairo, 0.2, 0.2, 0.2)
C.cairo_rectangle(W.Cairo, UIPadding, C.double(ry), C.double(WindowWidth-2*UIPadding), C.double(rh))
C.cairo_fill(W.Cairo)
if mouseClick[0] >= UIPadding && float64(mouseClick[1]) >= ry && float64(mouseClick[1]) <= ry+rh {
fmt.Println("Clicked tweet", t.Text)
}
// Draw user image
userImage := GetCachedImage(W.UserImages, t.UserImage)
if userImage == nil || C.cairo_surface_status(userImage) != C.CAIRO_STATUS_SUCCESS {
userImage = placeholderImage
}
C.cairo_set_source_surface(W.Cairo, userImage, 2*UIPadding, C.double(yPos+UIPadding))
C.cairo_paint(W.Cairo)
// Draw tweet text
C.cairo_move_to(W.Cairo, 63, C.double(yPos+SmallPadding))
C.cairo_set_source_rgb(W.Cairo, 0.95, 0.95, 0.95)
C.pango_cairo_show_layout(W.Cairo, t.Layout)
yPos += 5 + rh
}
}
func CreateXWindow(width, height int) (*XWindow, error) {
C.XInitThreads()
W := &XWindow{}
W.Display = C.XOpenDisplay(nil)
if W.Display == nil {
return &XWindow{}, errors.New("Can't open display")
}
W.Window = C.XCreateSimpleWindow(W.Display, C.XDefaultRootWindow(W.Display), 0, 0, C.uint(width), C.uint(height), 0, 0, 0xFF151515)
C.XSetWindowBackgroundPixmap(W.Display, W.Window, 0) // This avoids flickering on resize
C.XMapWindow(W.Display, W.Window)
C.XStoreName(W.Display, W.Window, C.CString("gowitt"))
C.XSelectInput(W.Display, W.Window, C.ExposureMask|C.KeyPressMask|C.ButtonPressMask)
C.XFlush(W.Display)
// Cairo
W.Surface = C.cairo_xlib_surface_create(W.Display, C.Drawable(W.Window), C.XDefaultVisual(W.Display, 0), C.int(width), C.int(height))
C.cairo_xlib_surface_set_size(W.Surface, C.int(width), C.int(height))
W.Cairo = C.cairo_create(W.Surface)
// Pango
InitLayoutsCache(W.Cairo)
W.PangoContext = C.pango_cairo_create_context(W.Cairo)
W.FontDesc = C.pango_font_description_from_string(C.CString("Sans 10"))
W.AttrList = C.pango_attr_list_new()
placeholderImage = C.cairo_image_surface_create_from_png(C.CString("test.png"))
W.UserImages = NewImageCache(func() {
var ev C.XEvent
exev := (*C.XExposeEvent)(unsafe.Pointer(&ev))
exev._type = C.Expose
exev.count = 0
exev.window = W.Window
exev.send_event = 1
exev.display = W.Display
C.XSendEvent(W.Display, W.Window, 0, C.ExposureMask, &ev)
C.XFlush(W.Display)
})
return W, nil
}
