透明小工具背景

我是pygtk中的新手。我正在寻找一种方式如何创建使用父backgorund作为自己的背景的自定义小部件这样的事情https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-prn1/31617_421363141269410_1875576801_n.jpg 透明小工具背景

如何获取父位图并将其用作其自己的位图？

class RoundRectPanel(gtk.DrawingArea, PanelBase): 
    """ 
    Panel That represents 
    """ 
    def __init__(self): 
     super(ProximityPanel, self).__init__() 

    def initialize(self): 
     super(RoundRectPanel, self).initialize() 

     self.set_size_request(340, 300) 
     self.connect('expose-event', self.expose) 

    def terminate(self): 
     pass 

    def rounded_rectangle(self, cr, x, y, w, h, r=20): 
     # A****BQ 
     # H  C 
     # *  * 
     # G  D 
     # F****E 

     cr.move_to(x+r,y)      # Move to A 
     cr.line_to(x+w-r,y)     # Straight line to B 
     cr.curve_to(x+w,y,x+w,y,x+w,y+r)  # Curve to C, Control points are both at Q 
     cr.line_to(x+w,y+h-r)     # Move to D 
     cr.curve_to(x+w,y+h,x+w,y+h,x+w-r,y+h) # Curve to E 
     cr.line_to(x+r,y+h)     # Line to F 
     cr.curve_to(x,y+h,x,y+h,x,y+h-r)  # Curve to G 
     cr.line_to(x,y+r)      # Line to H 
     cr.curve_to(x,y,x,y,x+r,y)    # Curve to A 

    def expose(self, canvas, event): 
     # Create cairo context 
     cr = canvas.window.cairo_create() 

     # TODO: 1. GET PARENT background 
     # 2. set it as canvas background 

     # 3. draw on it 
     self.rounded_rectangle(cr, 0, 0, 340, 300) 
     cr.stroke_preserve() 
     cr.set_source_rgba(1.0, 1.0, 1.0, 0.5) 
     cr.fill()

来源

2012-12-14 Taras Shchybovyk

我想你应该可以设置背景透明的GTK3与CSS的帮助，但到底我又不是父母的信息需要当然。 – deinonychusaur

当前找到了解决方法，它需要自定义小部件与其父窗口（绘制背景图像的位置）进行通信。 CustomWidget约背景图片（文件名和IMGE位置的窗口）

class CustomWidget(gtk.DrawingArea): 
def __init__(self, parent): 
    super(CustomWidget, self).__init__() 
    self.set_size_request(340, 300) 
    self._parent = parent 

    self.connect('expose-event', self._expose_event) 

def _expose_event(self, widget, event): 
    cr = widget.window.cairo_create() 

    self.draw_context(cr, widget) 

def draw_context(self, cr, widget): 
    ctx = cr 
    x, y, width, height = widget.allocation 

    # parent window should have file name that is used as a background 
    pixbuf = gtk.gdk.pixbuf_new_from_file(self._parent.file) 
    ctx.save() 
    # copy particular image region where your custom widget is located 
    ctx.set_source_pixbuf(pixbuf, (-x) + self._parent.image.allocation.x, (-y) + self._parent.image.allocation.y) 

    # draw background for custom widget 
    ctx.paint() 
    ctx.restore() 

    # now draw what ever you want 
    self.rounded_rectangle(cr, 0, 0, width, height) 
    cr.set_line_width(1.0) 
    cr.set_source_color(gtk.gdk.color_parse('grey')) 
    cr.stroke_preserve() 

    gradient = cairo.LinearGradient(width/2, 0, width/2, height) 
    gradient.add_color_stop_rgba(0.00, 1, 1, 1, 0.9) 
    gradient.add_color_stop_rgba(1.00, 0.4, 0.4, 0.4, 0.5) 
    cr.set_source(gradient) 
    cr.fill()

来源

2013-01-17 09:45:00

透明小工具背景

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