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by Jan Jokela
Hi, Glitter here |
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# !/usr/bin/python
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# -*- coding: utf-8 -*-
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# Glitter Toolkit
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__authors__ = ["Jan Jokela <janjokela@gmail.com>"] |
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__licenses__ = ["LICENSE.LGPL"] |
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__description__ = "Slider widget" |
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import gobject |
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from widget import * |
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from container import Container |
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from image import Image |
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class Slider(Container): |
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"""
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A slider widget offers a moveable handler for moving bewteen a range of
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values.
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"""
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__gsignals__ = { |
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'value-changed': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_BOOLEAN, |
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(gobject.TYPE_FLOAT,)) |
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}
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def __init__(self, value=0.5): |
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""" Initialize slider widget """
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super(Slider, self).__init__() |
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self._value = value |
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self.stage = None |
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self._init_elements() |
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self._update_style(self.style) |
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def _init_elements(self): |
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""" Initializes graphical elements """
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self._background_image = Image() |
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self.add(self._background_image) |
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self._range_image = Image() |
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self.add(self._range_image) |
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self._handle_image = Image() |
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self.add(self._handle_image) |
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self._handle_image.size_ratio = 1.0 |
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def _update_style(self, props=None): |
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""" Updates style """
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super(Slider, self)._update_style(props) |
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for key, value in props: |
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if key == 'background-image': |
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self.background_image = value |
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self._background_image.set_source(self.background_image) |
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self._background_image._update_layout() |
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elif key == 'range-image': |
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self.range_image = value |
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self._range_image.set_source(self.range_image) |
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self._range_image._update_layout() |
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elif key == 'handle-image': |
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self.handle_image = value |
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self._handle_image.set_source(self.handle_image) |
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self._handle_image._update_layout() |
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elif key == 'background-height': |
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self._background_image.natural_height = value |
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elif key == 'background-y': |
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self._background_image.natural_y = value |
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elif key == 'range-height': |
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self._range_image.natural_height = value |
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elif key == 'range-y': |
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self._range_image.natural_y = value |
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elif key == 'handle-height': |
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self._handle_image.natural_height = value |
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elif key == 'handle-y': |
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self._handle_image.natural_y = value |
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def _update_layout(self): |
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""" Updates layout """
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super(Slider, self)._update_layout() |
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if not self.stage: |
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self.stage = self.get_stage() |
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self.set_reactive(True) |
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self.stage.connect('motion-event', self.on_motion_event) |
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self.connect('leave-event', self.on_leave_event) |
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self.connect('button-press-event', self.on_press_event) |
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self.stage.connect('button-release-event', self.on_release_event) |
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18.1.3
by Jan Jokela
(glitter/box.py) Algorithm improvements |
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if self.get_width() > 0: |
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tmp_value = self.value - (float(self._handle_image.get_width() / 2.0) / float(self.get_width())) |
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else: |
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tmp_value = 0 |
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1
by Jan Jokela
Hi, Glitter here |
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self._range_image.set_natural_width(self.value) |
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self._handle_image.set_natural_x(tmp_value) |
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self._background_image._update_layout() |
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self._range_image._update_layout() |
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self._handle_image._update_layout() |
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def get_value(self): |
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""" Retrieve range value """
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return self._value |
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def set_value(self, value): |
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""" Sets value
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value -- (float) Slider range value 0.0~1.0
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"""
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self._value = value |
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self.emit("value-changed", value) |
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self._update_layout() |
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value = property(get_value, set_value) |
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def on_motion_event(self, widget, event): |
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""" Cursor motion over widget """
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if self.state is STATE_SELECTED: |
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x_px_from_anchor = event.x - self.get_transformed_position()[0] |
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pos_as_factor = float(x_px_from_anchor) / float(self.get_width()) |
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if pos_as_factor > 0 and pos_as_factor < 100: |
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self.value = pos_as_factor |
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elif pos_as_factor <= 0: |
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self.value = 0.0 |
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else: |
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self.value = 1.0 |
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def on_leave_event(self, widget, event): |
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""" Cursor left from widget """
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pass
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def on_press_event(self, widget, event): |
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""" Cursor press on widget area """
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self.state = STATE_SELECTED |
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def on_release_event(self, widget, event): |
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""" Cursos release on widget area """
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self.state = STATE_HIGHLIGHT |