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79 lines
1.6 KiB
79 lines
1.6 KiB
15 years ago
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require 'Qt'
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class Hello < Qt::Widget
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signals 'clicked()'
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slots 'animate()'
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# Constructs a Hello widget. Starts a 40 ms animation timer
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def initialize (text)
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super()
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@b = 0
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@text = text
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@sin_tbl = [0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38]
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timer = Qt::Timer.new(self);
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connect(timer, SIGNAL('timeout()'), SLOT('animate()'))
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timer.start(40);
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resize(260, 130)
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end
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# This slot is called each time the timer fires.
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def animate
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@b = (@b + 1) & 15
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repaint(false)
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end
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# Handles mouse button release events for the Hello widget.
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#
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# We emit the clicked() signal when the mouse is released inside
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# the widget.
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def mouseReleaseEvent(e)
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if (rect.contains(e.pos))
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emit clicked
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end
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end
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# Handles paint events for the Hello widget.
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#
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# Flicker-free update. The text is first drawn in the pixmap and the
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# pixmap is then blt'ed to the screen.
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def paintEvent(e)
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if @text.empty?
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return
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end
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# 1: Compute some sizes, positions etc.
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fm = fontMetrics
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w = fm.width(@text) + 20
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h = fm.height * 2
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pmx = width/2 - w/2
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pmy = height/2 - h/2
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# 2: Create the pixmap and fill it with the widget's background
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pm = Qt::Pixmap.new(w, h)
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pm.fill(self, pmx, pmy)
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# 3: Paint the pixmap. Cool wave effect
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p = Qt::Painter.new;
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x = 10
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y = h/2 + fm.descent
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i = 0
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p.begin(pm)
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p.setFont(font)
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for i in 0..@text.size-1
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j = (@b+i) & 15
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p.setPen(Qt::Color.new((15-j)*16,255,255,Qt::Color.Hsv) )
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p.drawText( x, y-@sin_tbl[j]*h/800, @text[i,1], 1 )
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x += fm.width(@text[i,1])
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end
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p.end
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#4: Copy the pixmap to the Hello widget
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bitBlt(self, pmx, pmy, pm)
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end
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end
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