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just be for the background.
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__copyright__ = "Copyright © 2005 Canonical Ltd."
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__copyright__ = "Copyright © 2005-2011 Canonical Ltd."
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__author__ = "Scott James Remnant <scott@ubuntu.com>"
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class CellRendererGraph(gtk.GenericCellRenderer):
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from gi.repository import Gtk
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from gi.repository import GObject
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from gi.repository import Pango
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from gi.repository import PangoCairo
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# Cairo constants are not exported yet. These are taken from documentation.
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CAIRO_LINE_CAP_BUTT = 0
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CAIRO_LINE_CAP_ROUND = 1
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CAIRO_LINE_CAP_SQUARE = 2
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CAIRO_FILL_RULE_WINDING = 0
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CAIRO_FILL_RULE_EVEN_ODD = 1
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# Macro from Pango header.
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return (d + 512) / 1000
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class CellRendererGraph(Gtk.CellRendererPixbuf):
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"""Cell renderer for directed graph.
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in_lines (start, end, colour) tuple list to draw inward lines,
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out_lines (start, end, colour) tuple list to draw outward lines.
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__gproperties__ = {
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"node": ( gobject.TYPE_PYOBJECT, "node",
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"node": ( GObject.TYPE_PYOBJECT, "node",
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"revision node instruction",
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gobject.PARAM_WRITABLE
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GObject.PARAM_WRITABLE
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"tags": ( gobject.TYPE_PYOBJECT, "tags",
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"tags": ( GObject.TYPE_PYOBJECT, "tags",
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"list of tags associated with the node",
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gobject.PARAM_WRITABLE
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GObject.PARAM_WRITABLE
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"in-lines": ( gobject.TYPE_PYOBJECT, "in-lines",
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"in-lines": ( GObject.TYPE_PYOBJECT, "in-lines",
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"instructions to draw lines into the cell",
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gobject.PARAM_WRITABLE
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GObject.PARAM_WRITABLE
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"out-lines": ( gobject.TYPE_PYOBJECT, "out-lines",
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"out-lines": ( GObject.TYPE_PYOBJECT, "out-lines",
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"instructions to draw lines out of the cell",
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gobject.PARAM_WRITABLE
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GObject.PARAM_WRITABLE
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def do_set_property(self, property, value):
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"""Set properties from GObject properties."""
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if property.name == "node":
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return self._box_size
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except AttributeError:
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pango_ctx = widget.get_pango_context()
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font_desc = widget.get_style().font_desc
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metrics = pango_ctx.get_metrics(font_desc)
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ascent = pango.PIXELS(metrics.get_ascent())
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descent = pango.PIXELS(metrics.get_descent())
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font_desc = widget.get_style_context().get_font(
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metrics = pango_ctx.get_metrics(font_desc, None)
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ascent = PANGO_PIXELS(metrics.get_ascent())
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descent = PANGO_PIXELS(metrics.get_descent())
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self._box_size = ascent + descent + 6
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return self._box_size
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ctx.set_source_rgb(red, green, blue)
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def on_get_size(self, widget, cell_area):
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def do_activate(event, widget, path, bg_area, cell_area, flags):
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"""Renderers cannot be activated; always return True."""
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def do_editing_started(event, widget, path, fb_area, cell_area, flags):
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"""Renderers cannot be edited; always return None."""
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def do_get_size(self, widget, cell_area):
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"""Return the size we need for this cell.
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Each cell is drawn individually and is only as wide as it needs
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# FIXME I have no idea how to use cell_area properly
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return (0, 0, width, height)
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def on_render(self, window, widget, bg_area, cell_area, exp_area, flags):
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def do_render(self, ctx, widget, bg_area, cell_area, flags):
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"""Render an individual cell.
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Draws the cell contents using cairo, taking care to clip what we
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instead of a pure diagonal ... this reduces confusion by an
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incredible amount.
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ctx = window.cairo_create()
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ctx.rectangle(bg_area.x, bg_area.y, bg_area.width, bg_area.height)
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cell_area.y + cell_area.height / 2,
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box_size / 4, 0, 2 * math.pi)
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if flags & gtk.CELL_RENDERER_SELECTED:
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if flags & Gtk.CellRendererState.SELECTED:
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ctx.set_source_rgb(1.0, 1.0, 1.0)
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ctx.set_line_width(box_size / 4)
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ctx.stroke_preserve()
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self.render_tags(ctx, widget.create_pango_context(), cell_area, box_size)
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def render_line(self, ctx, cell_area, box_size, mid, height, start, end, colour, flags):
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def render_line(self, ctx, cell_area, box_size,
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mid, height, start, end, colour, flags):
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if start is None:
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ctx.set_line_cap(cairo.LINE_CAP_ROUND)
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ctx.set_line_cap(CAIRO_LINE_CAP_ROUND)
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x = cell_area.x + box_size * end + box_size / 2
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ctx.move_to(x, mid + height / 3)
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ctx.line_to(x, mid + height / 3)
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ctx.move_to(x, mid + height / 6)
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ctx.line_to(x, mid + height / 6)
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elif end is None:
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ctx.set_line_cap(cairo.LINE_CAP_ROUND)
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ctx.set_line_cap(CAIRO_LINE_CAP_ROUND)
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x = cell_area.x + box_size * start + box_size / 2
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ctx.move_to(x, mid - height / 3)
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ctx.line_to(x, mid - height / 3)
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ctx.line_to(x, mid - height / 6)
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ctx.set_line_cap(cairo.LINE_CAP_BUTT)
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ctx.set_line_cap(CAIRO_LINE_CAP_BUTT)
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startx = cell_area.x + box_size * start + box_size / 2
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endx = cell_area.x + box_size * end + box_size / 2
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ctx.move_to(startx, mid - height / 2)
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if start - end == 0 :
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ctx.line_to(endx, mid + height / 2 + 1)
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endx, mid + height / 5 ,
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endx, mid + height / 2 + 1)
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if flags & gtk.CELL_RENDERER_SELECTED:
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if flags & Gtk.CellRendererState.SELECTED:
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ctx.set_source_rgb(1.0, 1.0, 1.0)
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ctx.set_line_width(box_size / 5)
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ctx.stroke_preserve()
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(column, colour) = self.node
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font_desc = pango.FontDescription()
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font_desc.set_size(pango.SCALE * 7)
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font_desc = Pango.FontDescription()
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font_desc.set_size(Pango.SCALE * 7)
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tag_layout = pango.Layout(pango_ctx)
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tag_layout = Pango.Layout(pango_ctx)
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tag_layout.set_font_description(font_desc)
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# The width of the tag label stack
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for tag_idx, tag in enumerate(self.tags):
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tag_layout.set_text(" " + tag + " ")
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tag_layout.set_text(" " + tag + " ", -1)
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text_width, text_height = tag_layout.get_pixel_size()
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x0 = cell_area.x + \
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self.set_colour(ctx, TAG_COLOUR_ID, 0.0, 0.5)
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ctx.stroke_preserve()
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ctx.set_fill_rule (cairo.FILL_RULE_EVEN_ODD)
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ctx.set_fill_rule (CAIRO_FILL_RULE_EVEN_ODD)
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self.set_colour(ctx, TAG_COLOUR_ID, 0.5, 1.0)
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# Draw the tag text
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self.set_colour(ctx, 0, 0.0, 0.0)
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ctx.move_to(x0, y0)
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ctx.show_layout(tag_layout)
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PangoCairo.show_layout(ctx, tag_layout)