You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
1.6 KiB
79 lines
1.6 KiB
require 'Qt'
|
|
|
|
class Hello < TQt::Widget
|
|
|
|
signals 'clicked()'
|
|
slots 'animate()'
|
|
|
|
# Constructs a Hello widget. Starts a 40 ms animation timer
|
|
def initialize (text)
|
|
super()
|
|
|
|
@b = 0
|
|
@text = text
|
|
@sin_tbl = [0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38]
|
|
timer = TQt::Timer.new(self);
|
|
connect(timer, SIGNAL('timeout()'), SLOT('animate()'))
|
|
timer.start(40);
|
|
|
|
resize(260, 130)
|
|
end
|
|
|
|
# This slot is called each time the timer fires.
|
|
def animate
|
|
@b = (@b + 1) & 15
|
|
repaint(false)
|
|
end
|
|
|
|
# Handles mouse button release events for the Hello widget.
|
|
#
|
|
# We emit the clicked() signal when the mouse is released inside
|
|
# the widget.
|
|
def mouseReleaseEvent(e)
|
|
if (rect.contains(e.pos))
|
|
emit clicked
|
|
end
|
|
end
|
|
|
|
# Handles paint events for the Hello widget.
|
|
#
|
|
# Flicker-free update. The text is first drawn in the pixmap and the
|
|
# pixmap is then blt'ed to the screen.
|
|
def paintEvent(e)
|
|
if @text.empty?
|
|
return
|
|
end
|
|
|
|
# 1: Compute some sizes, positions etc.
|
|
fm = fontMetrics
|
|
|
|
w = fm.width(@text) + 20
|
|
h = fm.height * 2
|
|
pmx = width/2 - w/2
|
|
pmy = height/2 - h/2
|
|
|
|
# 2: Create the pixmap and fill it with the widget's background
|
|
pm = TQt::Pixmap.new(w, h)
|
|
pm.fill(self, pmx, pmy)
|
|
|
|
# 3: Paint the pixmap. Cool wave effect
|
|
p = TQt::Painter.new;
|
|
x = 10
|
|
y = h/2 + fm.descent
|
|
i = 0
|
|
p.begin(pm)
|
|
p.setFont(font)
|
|
|
|
for i in 0..@text.size-1
|
|
j = (@b+i) & 15
|
|
p.setPen(TQt::Color.new((15-j)*16,255,255,TQt::Color.Hsv) )
|
|
p.drawText( x, y-@sin_tbl[j]*h/800, @text[i,1], 1 )
|
|
x += fm.width(@text[i,1])
|
|
end
|
|
p.end
|
|
|
|
#4: Copy the pixmap to the Hello widget
|
|
bitBlt(self, pmx, pmy, pm)
|
|
end
|
|
end
|