Mercurial > libervia-web

annotate src/browser/sat_browser/base_menu.py @ 1019:34240d08f682

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pages: HTTP cache headers handling: when checkCache is used, HTTP headers handling cache are now used: - ETag is first checked, using a hash of the rendered content - Last-Modified is used as a fallback is client is not handling ETag When suitable, a HTTP 304 code (Not Modified) wihtout body is returned instead of the whole page.
author Goffi <goffi@goffi.org>
date Sun, 21 Jan 2018 13:14:06 +0100
parents fd4eae654182
children f2170536ba23
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rev   line source
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # Libervia: a Salut à Toi frontend
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5 # Copyright (C) 2011-2017 Jérôme Poisson <goffi@goffi.org>
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20
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21 """Base classes for building a menu.
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22
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23 These classes have been moved here from menu.py because they are also used
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24 by base_widget.py, and the import sequence caused a JS runtime error."""
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25
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26
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27 from sat.core.log import getLogger
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28 log = getLogger(__name__)
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29
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30 from pyjamas.ui.MenuBar import MenuBar
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31 from pyjamas.ui.MenuItem import MenuItem
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32 from pyjamas import Window
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33 from sat_frontends.quick_frontend import quick_menus
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34 from sat_browser import html_tools
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36
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37 unicode = str # FIXME: pyjamas workaround
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38
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39
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40 class MenuCmd(object):
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41 """Return an object with an "execute" method that can be set to a menu item callback"""
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42
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43 def __init__(self, menu_item, caller=None):
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44 """
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45 @param menu_item(quick_menu.MenuItem): instance of a callbable MenuItem
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46 @param caller: menu caller
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47 """
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48 self.item = menu_item
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49 self._caller = caller
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50
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51 def execute(self):
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52 self.item.call(self._caller)
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53
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54
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55 class SimpleCmd(object):
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56 """Return an object with an "executre" method that launch a callback"""
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57
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58 def __init__(self, callback):
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59 """
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60 @param callback: method to call when menu is selected
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61 """
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62 self.callback = callback
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63
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64 def execute(self):
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65 self.callback()
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67
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68 class GenericMenuBar(MenuBar):
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69 """A menu bar with sub-categories and items"""
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70
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71 def __init__(self, host, vertical=False, styles=None, flat_level=0, **kwargs):
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72 """
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73 @param host (SatWebFrontend): host instance
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74 @param vertical (bool): True to display the popup menu vertically
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75 @param styles (dict): specific styles to be applied:
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76 - key: a value in ('moved_popup', 'menu_bar')
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77 - value: a CSS class name
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78 @param flat_level (int): sub-menus until that level see their items
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79 displayed in the parent menu bar instead of in a callback popup.
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80 """
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81 MenuBar.__init__(self, vertical, **kwargs)
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82 self.host = host
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83 self.styles = {}
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84 if styles:
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85 self.styles.update(styles)
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86 try:
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87 self.setStyleName(self.styles['menu_bar'])
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88 except KeyError:
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89 pass
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90 self.menus_container = None
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91 self.flat_level = flat_level
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92
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93 def update(self, type_, caller=None):
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94 """Method to call when menus have changed
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95
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96 @param type_: menu type like in sat.core.sat_main.importMenu
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97 @param caller: instance linked to the menus
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98 """
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99 self.menus_container = self.host.menus.getMainContainer(type_)
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100 self._caller=caller
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101 self.createMenus()
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102
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103 @classmethod
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104 def getCategoryHTML(cls, category):
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105 """Build the html to be used for displaying a category item.
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106
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107 Inheriting classes may overwrite this method.
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108 @param category (quick_menus.MenuCategory): category to add
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109 @return unicode: HTML to display
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110 """
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111 return html_tools.html_sanitize(category.name)
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112
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113 def _buildMenus(self, container, flat_level, caller=None):
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114 """Recursively build menus of the container
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115
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116 @param container: a quick_menus.MenuContainer instance
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117 @param caller: instance linked to the menus
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118 """
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119 for child in container.getActiveMenus():
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120 if isinstance(child, quick_menus.MenuContainer):
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121 item = self.addCategory(child, flat=bool(flat_level))
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122 submenu = item.getSubMenu()
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123 if submenu is None:
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124 submenu = self
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125 submenu._buildMenus(child, flat_level-1 if flat_level else 0, caller)
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126 elif isinstance(child, quick_menus.MenuSeparator):
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127 item = MenuItem(text='', asHTML=None, StyleName="menuSeparator")
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128 self.addItem(item)
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129 elif isinstance(child, quick_menus.MenuItem):
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130 self.addItem(child.name, False, MenuCmd(child, caller) if child.CALLABLE else None)
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131 else:
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132 log.error(u"Unknown child type: {}".format(child))
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133
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134 def createMenus(self):
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135 self.clearItems()
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136 if self.menus_container is None:
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137 log.debug("Menu is empty")
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138 return
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139 self._buildMenus(self.menus_container, self.flat_level, self._caller)
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140
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141 def doItemAction(self, item, fireCommand):
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142 """Overwrites the default behavior for the popup menu to fit in the screen"""
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143 MenuBar.doItemAction(self, item, fireCommand)
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144 if not self.popup:
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145 return
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146 if self.vertical:
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147 # move the popup if it would go over the screen's viewport
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148 max_left = Window.getClientWidth() - self.getOffsetWidth() + 1 - self.popup.getOffsetWidth()
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149 new_left = self.getAbsoluteLeft() - self.popup.getOffsetWidth() + 1
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150 top = item.getAbsoluteTop()
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151 else:
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152 # move the popup if it would go over the menu bar right extremity
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153 max_left = self.getAbsoluteLeft() + self.getOffsetWidth() - self.popup.getOffsetWidth()
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154 new_left = max_left
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155 top = self.getAbsoluteTop() + self.getOffsetHeight() - 1
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156 if item.getAbsoluteLeft() > max_left:
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157 self.popup.setPopupPosition(new_left, top)
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158 # eventually smooth the popup edges to fit the menu own style
676
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159 try:
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160 self.popup.addStyleName(self.styles['moved_popup'])
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161 except KeyError:
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162 pass
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163
676
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164 def addCategory(self, category, menu_bar=None, flat=False):
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165 """Add a new category.
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166
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167 @param category (quick_menus.MenuCategory): category to add
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168 @param menu_bar (GenericMenuBar): instance to popup as the category sub-menu.
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169 """
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170 html = self.getCategoryHTML(category)
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171
676
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172 if menu_bar is not None:
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173 assert not flat # can't have a menu_bar and be flat at the same time
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174 sub_menu = menu_bar
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175 elif not flat:
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176 sub_menu = GenericMenuBar(self.host, vertical=True)
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177 else:
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178 sub_menu = None
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179
676
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180 item = self.addItem(html, True, sub_menu)
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181 if flat:
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182 item.setStyleName("menuFlattenedCategory")
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183 return item