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sugar-toolkit-gtk3/examples/scrollingdetector.py

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Detect scrolling in treviews and optimize drawing Detecting if the treeview is scrolling we can improve the performance of the CellRendererIcon by avoiding unneeded calculations. The example scrollingdetector.py shows how this can be used. The changes are backward compatible. Signed-off-by: Manuel Quiñones <manuel.por.aca@gmail.com> Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>
2014-05-07 14:20:14 +02:00
import os
import time
from gi.repository import Gtk
from sugar3.graphics import style
from sugar3.graphics.icon import CellRendererIcon
from sugar3.graphics.xocolor import XoColor
from sugar3.graphics.scrollingdetector import ScrollingDetector
New invoker, TreeViewInvoker This new invoker is able to handle all the palettes on a treeview, removing the need of one invoker per cell renderer (CellRendererInvoker). This simplifies the code and makes it more efficient. Also removes the logic from the CellRendererIcon, which should only care about drawing itself. [1] Is important to note than in Gtk3 a CellRenderer is not a GtkWidget then can't know when the mouse is over it or have the usual events used by other invokers, making the implementation CellRendererInvoker very complicate. This commit also removes the invoker of CellRendererIcon. The ScrollingDetector logic is simplified too, because now there are only one invoker instead of one by renderer and the example code updated. [1] https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html
2014-11-28 12:45:22 +01:00
from sugar3.graphics.palettewindow import TreeViewInvoker
Detect scrolling in treviews and optimize drawing Detecting if the treeview is scrolling we can improve the performance of the CellRendererIcon by avoiding unneeded calculations. The example scrollingdetector.py shows how this can be used. The changes are backward compatible. Signed-off-by: Manuel Quiñones <manuel.por.aca@gmail.com> Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>
2014-05-07 14:20:14 +02:00
import common
New invoker, TreeViewInvoker This new invoker is able to handle all the palettes on a treeview, removing the need of one invoker per cell renderer (CellRendererInvoker). This simplifies the code and makes it more efficient. Also removes the logic from the CellRendererIcon, which should only care about drawing itself. [1] Is important to note than in Gtk3 a CellRenderer is not a GtkWidget then can't know when the mouse is over it or have the usual events used by other invokers, making the implementation CellRendererInvoker very complicate. This commit also removes the invoker of CellRendererIcon. The ScrollingDetector logic is simplified too, because now there are only one invoker instead of one by renderer and the example code updated. [1] https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html
2014-11-28 12:45:22 +01:00
def _scroll_start_cb(event, treeview, invoker):
print "Scroll starts"
invoker.detach()
fixed the flake8 errors for examples doesn't affect that much the code, it just remove unused modules and make it look better.
2017-01-05 01:02:26 +01:00
New invoker, TreeViewInvoker This new invoker is able to handle all the palettes on a treeview, removing the need of one invoker per cell renderer (CellRendererInvoker). This simplifies the code and makes it more efficient. Also removes the logic from the CellRendererIcon, which should only care about drawing itself. [1] Is important to note than in Gtk3 a CellRenderer is not a GtkWidget then can't know when the mouse is over it or have the usual events used by other invokers, making the implementation CellRendererInvoker very complicate. This commit also removes the invoker of CellRendererIcon. The ScrollingDetector logic is simplified too, because now there are only one invoker instead of one by renderer and the example code updated. [1] https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html
2014-11-28 12:45:22 +01:00
def _scroll_end_cb(event, treeview, invoker):
print "Scroll ends"
invoker.attach_treeview(treeview)
fixed the flake8 errors for examples doesn't affect that much the code, it just remove unused modules and make it look better.
2017-01-05 01:02:26 +01:00
Detect scrolling in treviews and optimize drawing Detecting if the treeview is scrolling we can improve the performance of the CellRendererIcon by avoiding unneeded calculations. The example scrollingdetector.py shows how this can be used. The changes are backward compatible. Signed-off-by: Manuel Quiñones <manuel.por.aca@gmail.com> Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>
2014-05-07 14:20:14 +02:00
test = common.Test()
test.show()
model = Gtk.ListStore(str)
data_dir = os.getenv('GTK_DATA_PREFIX', '/usr/')
iconlist = os.listdir(os.path.join(data_dir,
'share/icons/sugar/scalable/actions/'))
print "Displaying %s icons" % len(iconlist)
for icon in iconlist:
icon = os.path.basename(icon)
icon = icon[:icon.find('.')]
model.append([icon])
scrolled = Gtk.ScrolledWindow()
scrolled.set_size_request(800, 800)
treeview = Gtk.TreeView()
treeview.set_model(model)
scrolled.add(treeview)
test.pack_start(scrolled, True, True, 0)
test.show_all()
col = Gtk.TreeViewColumn()
treeview.append_column(col)
xo_color = XoColor('#FF0000,#00FF00')
New invoker, TreeViewInvoker This new invoker is able to handle all the palettes on a treeview, removing the need of one invoker per cell renderer (CellRendererInvoker). This simplifies the code and makes it more efficient. Also removes the logic from the CellRendererIcon, which should only care about drawing itself. [1] Is important to note than in Gtk3 a CellRenderer is not a GtkWidget then can't know when the mouse is over it or have the usual events used by other invokers, making the implementation CellRendererInvoker very complicate. This commit also removes the invoker of CellRendererIcon. The ScrollingDetector logic is simplified too, because now there are only one invoker instead of one by renderer and the example code updated. [1] https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html
2014-11-28 12:45:22 +01:00
cell_icon = CellRendererIcon()
Detect scrolling in treviews and optimize drawing Detecting if the treeview is scrolling we can improve the performance of the CellRendererIcon by avoiding unneeded calculations. The example scrollingdetector.py shows how this can be used. The changes are backward compatible. Signed-off-by: Manuel Quiñones <manuel.por.aca@gmail.com> Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>
2014-05-07 14:20:14 +02:00
cell_icon.props.width = style.GRID_CELL_SIZE
cell_icon.props.height = style.GRID_CELL_SIZE
cell_icon.props.size = style.STANDARD_ICON_SIZE
cell_icon.props.xo_color = xo_color
col.pack_start(cell_icon, expand=False)
col.add_attribute(cell_icon, 'icon-name', 0)
cell_text = Gtk.CellRendererText()
col.pack_start(cell_text, expand=True)
col.add_attribute(cell_text, 'text', 0)
New invoker, TreeViewInvoker This new invoker is able to handle all the palettes on a treeview, removing the need of one invoker per cell renderer (CellRendererInvoker). This simplifies the code and makes it more efficient. Also removes the logic from the CellRendererIcon, which should only care about drawing itself. [1] Is important to note than in Gtk3 a CellRenderer is not a GtkWidget then can't know when the mouse is over it or have the usual events used by other invokers, making the implementation CellRendererInvoker very complicate. This commit also removes the invoker of CellRendererIcon. The ScrollingDetector logic is simplified too, because now there are only one invoker instead of one by renderer and the example code updated. [1] https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html
2014-11-28 12:45:22 +01:00
invoker = TreeViewInvoker()
invoker.attach_treeview(treeview)
Detect scrolling in treviews and optimize drawing Detecting if the treeview is scrolling we can improve the performance of the CellRendererIcon by avoiding unneeded calculations. The example scrollingdetector.py shows how this can be used. The changes are backward compatible. Signed-off-by: Manuel Quiñones <manuel.por.aca@gmail.com> Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>
2014-05-07 14:20:14 +02:00
detector = ScrollingDetector(scrolled)
New invoker, TreeViewInvoker This new invoker is able to handle all the palettes on a treeview, removing the need of one invoker per cell renderer (CellRendererInvoker). This simplifies the code and makes it more efficient. Also removes the logic from the CellRendererIcon, which should only care about drawing itself. [1] Is important to note than in Gtk3 a CellRenderer is not a GtkWidget then can't know when the mouse is over it or have the usual events used by other invokers, making the implementation CellRendererInvoker very complicate. This commit also removes the invoker of CellRendererIcon. The ScrollingDetector logic is simplified too, because now there are only one invoker instead of one by renderer and the example code updated. [1] https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html
2014-11-28 12:45:22 +01:00
detector.connect('scroll-start', _scroll_start_cb, treeview, invoker)
detector.connect('scroll-end', _scroll_end_cb, treeview, invoker)
Detect scrolling in treviews and optimize drawing Detecting if the treeview is scrolling we can improve the performance of the CellRendererIcon by avoiding unneeded calculations. The example scrollingdetector.py shows how this can be used. The changes are backward compatible. Signed-off-by: Manuel Quiñones <manuel.por.aca@gmail.com> Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>
2014-05-07 14:20:14 +02:00
if __name__ == '__main__':
time_ini = time.time()
common.main(test)
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