add new example (by Adam Olsen and Behdad Esfahbod), fixes #400810

svn path=/trunk/; revision=2939

2 files changed, 201 insertions, 0 deletions

diff --git a/examples/Makefile.am b/examples/Makefile.am
index e53dbbd3..58d07ae1 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -51,6 +51,7 @@ EXTRA_DIST = \
 	ide/dialogs.py		\
 	pango/utf8-demo.py	\
 	pango/pangocairo-simple.py \
+	pango/extentdemo.py	\
 	simple/README		\
 	simple/dnd.py		\
 	simple/dndpixmap.py	\
diff --git a/examples/pango/extentdemo.py b/examples/pango/extentdemo.py
new file mode 100644
index 00000000..d663c52f
--- /dev/null
+++ b/examples/pango/extentdemo.py
@@ -0,0 +1,200 @@
+#!/usr/bin/env python2.4
+# -*- coding:utf8 -*-
+#
+# I, Adam Olsen, am the original author of this work.  I hereby
+# donate it into the public domain, and relinquish any rights I
+# may have in it.
+#
+# I, Behdad Esfahbod, hereby disclaim any rights for my contributions
+# to this code.
+
+from __future__ import division
+
+import sys
+import cairo
+import pygtk
+pygtk.require('2.0')
+import gtk
+import gtk.gdk
+import pango
+import gobject
+
+def generate_modes():
+    for align_desc, align in [('left', pango.ALIGN_LEFT),
+            ('center', pango.ALIGN_CENTER), ('right', pango.ALIGN_RIGHT)]:
+        for extent_desc, extentindex in [('logical', 1), ('ink', 0)]:
+            for name in ['line', 'run', 'cluster', 'char']:
+                if name == 'char' and extent_desc == 'ink':
+                    continue
+                desc = '%s %s %s' % (align_desc, extent_desc, name)
+                yield extentindex, name, align, desc
+
+class ExtentDemo(gtk.Widget):
+    def __init__(self, text="""Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor.\n\tسلامی چو بوی خوشِ آشنایی... بر آن ملّتِ دیرام‌دام دیرام..."""):
+        gtk.Widget.__init__(self)
+        self.text = "foo"
+        self.text = text
+	self.all_modes = list(generate_modes())
+	self.mode_num = 0;
+
+	self.x_margin = 5
+	self.y_margin = 5
+	self.x_offset = 0
+	self.y_offset = 25
+	self.font_size = 36
+
+    def do_realize(self):
+        self.set_flags(self.flags() | gtk.REALIZED)
+
+        self.window = gtk.gdk.Window(
+            self.get_parent_window(),
+            width=self.allocation.width,
+            height=self.allocation.height,
+            window_type=gtk.gdk.WINDOW_CHILD,
+            wclass=gtk.gdk.INPUT_OUTPUT,
+            event_mask=self.get_events() | gtk.gdk.EXPOSURE_MASK)
+
+        self.window.set_user_data(self)
+
+        self.style.attach(self.window)
+
+        self.style.set_background(self.window, gtk.STATE_NORMAL)
+        self.window.move_resize(*self.allocation)
+
+    def do_unrealize(self):
+        self.window.destroy()
+
+    def do_size_request(self, requisition):
+
+	width = 800
+
+	layout = self.get_layout(self.get_pango_context())
+	layout.set_width (pango.SCALE * (width     - (self.x_offset + 2 * self.x_margin)))
+	height = layout.get_pixel_extents ()[1][3] + (self.y_offset + 2 * self.y_margin)
+
+        requisition.width  = width
+        requisition.height = height
+
+    def do_expose_event(self, event):
+        context = self.window.cairo_create()
+        context.rectangle(event.area.x, event.area.y,
+                          event.area.width, event.area.height)
+        context.clip()
+        pangocontext = self.get_pango_context()
+
+        self.draw(context, pangocontext)
+
+        return False
+
+
+    def get_layout (self, pangocontext):
+        font = pango.FontDescription()
+        font.set_family("sans")
+        font.set_size(self.font_size * pango.SCALE)
+
+        layout = pango.Layout(pangocontext)
+        layout.set_font_description(font)
+        layout.set_text(self.text)
+
+	return layout
+
+    def draw(self, context, pangocontext):
+
+    	context.set_source_rgb (1, 1, 1)
+	context.paint()
+    	context.set_source_rgb (0, 0, 0)
+
+	context.translate (self.x_margin, self.y_margin)
+
+        extentindex, name, align, desc = self.all_modes[self.mode_num]
+
+        labellayout = pango.Layout(pangocontext)
+        labellayout.set_text('%i: %s' % (self.mode_num + 1, desc))
+        context.move_to(0, 0)
+        context.show_layout(labellayout)
+
+
+	context.translate (self.x_offset, self.y_offset)
+
+	layout = self.get_layout (pangocontext)
+        width  = self.allocation.width  - (self.x_offset + 2 * self.x_margin)
+        layout.set_width(width * pango.SCALE)
+        layout.set_alignment(align)
+
+        context.move_to(0, 0)
+
+	#context.layout_path(layout)
+	#context.fill()
+        context.show_layout(layout)
+
+        context.set_source_rgba(1, 0, 0, 0.5)
+    	context.set_line_width (2)
+        x, y, width, height = layout.get_pixel_extents()[extentindex]
+        context.rectangle(x-1, y-1, width+2, height+2)
+        context.stroke()
+
+        context.set_source_rgba(0, 1, 0, 0.7)
+    	context.set_line_width (1)
+
+        li = layout.get_iter()
+
+        while True:
+            extents = getattr(li, 'get_%s_extents' % name)()
+            if name != 'char':
+                extents = extents[extentindex]
+            x, y, width, height = self._descale(extents)
+            context.rectangle(x+.5, y+.5, width-1, height-1)
+            context.stroke()
+
+            if not getattr(li, 'next_%s' % name)():
+                break
+
+    def cycle_mode_forward(self):
+        self.mode_num += 1
+        if self.mode_num >= len(self.all_modes):
+            self.mode_num = 0
+        self.queue_draw()
+
+    def cycle_mode_backward(self):
+        self.mode_num -= 1
+        if self.mode_num < 0:
+            self.mode_num = len(self.all_modes) - 1
+        self.queue_draw()
+
+    def key_press_event(self, widget, event):
+        if event.string == ' ' or event.keyval == gtk.keysyms.Right:
+            self.cycle_mode_forward()
+        elif event.keyval == gtk.keysyms.BackSpace or event.keyval == gtk.keysyms.Left:
+            self.cycle_mode_backward()
+        elif event.string == 'q':
+            gtk.main_quit()
+
+    def _descale(self, rect):
+        return (i / pango.SCALE for i in rect)
+
+    def run(self):
+        window = gtk.Window()
+        window.add(self)
+        window.connect("destroy", gtk.main_quit)
+        window.connect("key-press-event", self.key_press_event)
+        window.show_all()
+
+        gtk.main()
+
+gobject.type_register(ExtentDemo)
+
+
+def main():
+    if len (sys.argv) > 2:
+        ed = ExtentDemo(sys.argv[2])
+    else:
+        ed = ExtentDemo()
+    if len (sys.argv) > 1:
+	mode = int(sys.argv[1])
+	while mode > 1:
+	    mode -= 1
+	    ed.cycle_mode()
+    ed.run()
+
+if __name__ == "__main__":
+    main()