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annotate libervia/pages/_browser/slideshow.py @ 1340:d5f6793dc17c

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browser (slideshow): use non zero threshold to avoid accidental swipe
author Goffi <goffi@goffi.org>
date Mon, 24 Aug 2020 22:47:51 +0200
parents 5ff6e187084f
children a8bc1ee455ae
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1310
9e356f8eb62c browser (slideshow): (un)hide controls on single click:
Goffi <goffi@goffi.org>
parents: 1309
diff changeset
1 from browser import document, window, html, timer, DOMNode
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2 from js_modules.swiper import Swiper
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3 from template import Template
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4
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5
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6 class SlideShow:
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7
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8 def __init__(self):
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9 self.swiper = None
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10 slideshow_tpl = Template('photo/slideshow.html')
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11 self.slideshow_elt = slideshow_tpl.get_elt()
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12 self.comments_count_elt = self.slideshow_elt.select_one('.comments__count')
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13 self.wrapper = self.slideshow_elt.select_one(".swiper-wrapper")
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14 self.hidden_elts = {}
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15 self.control_hidden = False
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16 self.click_timer = None
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17
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18 @property
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19 def current_slide(self):
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20 if self.swiper is None:
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21 return None
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22 try:
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23 return DOMNode(self.swiper.slides[self.swiper.realIndex])
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24 # getting missing item in JS arrays returns KeyError
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25 except KeyError:
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26 return None
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27
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28 @property
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29 def current_item(self):
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30 """item attached to the current slide, if any"""
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31 current = self.current_slide
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32 if current is None:
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33 return
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34 try:
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35 return current.js._item
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36 except AttributeError:
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37 return None
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38
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39 @property
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40 def index(self):
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41 if self.swiper is None:
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42 return None
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43 return self.swiper.realIndex
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44
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45 @index.setter
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46 def index(self, idx):
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47 if self.swiper is not None:
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48 self.swiper.slideTo(idx, 0)
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49
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50 def attach(self):
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51 # we hide other elts to avoid scrolling issues
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52 for elt in document.body.children:
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53 self.hidden_elts[elt] = elt.style.display
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54 elt.style.display = "none"
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55 document.body <= self.slideshow_elt
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56 self.swiper = Swiper.new(
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57 ".swiper-container",
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58 {
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59 # default 0 value results in lot of accidental swipes, notably when media
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60 # player is used
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61 "threshold": 10,
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62 "pagination": {
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63 "el": ".swiper-pagination",
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64 },
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65 "navigation": {
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66 "nextEl": ".swiper-button-next",
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67 "prevEl": ".swiper-button-prev",
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68 },
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69 "scrollbar": {
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70 "el": ".swiper-scrollbar",
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71 },
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72 "grabCursor": True,
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73 "keyboard": {
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74 "enabled": True,
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75 "onlyInViewport": False,
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76 },
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77 "mousewheel": True,
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78 "zoom": {
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79 "maxRatio": 15,
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80 "toggle": False,
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81 },
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82 }
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83 )
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84 window.addEventListener("keydown", self.on_key_down, True)
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85 self.slideshow_elt.select_one(".click_to_close").bind("click", self.on_close)
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86 self.slideshow_elt.select_one(".click_to_comment").bind("click", self.on_comment)
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87 self.swiper.on("slideChange", self.on_slide_change)
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88 self.swiper.on("click", self.on_click)
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89 self.swiper.on("doubleTap", self.on_double_tap)
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90 self.on_slide_change(self.swiper)
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91 self.fullscreen(True)
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92
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93 def add_slide(self, elt, item_data=None):
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94 slide_elt = html.DIV(Class="swiper-slide")
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95 zoom_cont_elt = html.DIV(Class="swiper-zoom-container")
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96 slide_elt <= zoom_cont_elt
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97 zoom_cont_elt <= elt
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98 slide_elt._item = item_data
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99 self.swiper.appendSlide([slide_elt])
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100 self.swiper.update()
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101
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102 def quit(self):
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103 # we unhide
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104 for elt, display in self.hidden_elts.items():
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105 elt.style.display = display
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106 self.hidden_elts.clear()
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107 self.slideshow_elt.remove()
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108 self.slideshow_elt = None
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109 self.swiper.destroy(True, True)
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110 self.swiper = None
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111
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112 def fullscreen(self, active=None):
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113 """Activate/desactivate fullscreen
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114
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115 @param acvite: can be:
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116 - True to activate
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117 - False to desactivate
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118 - Auto to switch fullscreen mode
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119 """
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120 try:
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121 fullscreen_elt = document.fullscreenElement
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122 request_fullscreen = self.slideshow_elt.requestFullscreen
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123 except AttributeError:
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124 print("fullscreen is not available on this browser")
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125 else:
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126 if active is None:
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127 active = fullscreen_elt == None
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128 if active:
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129 request_fullscreen()
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130 else:
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131 try:
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132 document.exitFullscreen()
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133 except AttributeError:
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134 print("exitFullscreen not available on this browser")
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135
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136 def on_key_down(self, evt):
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137 if evt.key == 'Escape':
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138 self.quit()
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139 else:
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140 return
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141 evt.preventDefault()
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142
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143 def on_slide_change(self, swiper):
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144 item = self.current_item
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145 if item is None:
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146 return
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147 comments_count = item.get('comments_count')
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148 self.comments_count_elt.text = comments_count or ''
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149
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150 def toggle_hide_controls(self, evt):
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151 self.click_timer = None
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152 if 'click_to_hide' in evt.target.classList:
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153 # we don't want to hide controls when a control is clicked
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154 return
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155 for elt in self.slideshow_elt.select('.click_to_hide'):
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156 elt.style.display = '' if self.control_hidden else 'none'
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157 self.control_hidden = not self.control_hidden
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158
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159 def on_click(self, swiper, evt):
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160 # we use a timer so double tap can cancel the click
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161 # this avoid double tap side effect
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162 if self.click_timer is None:
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163 self.click_timer = timer.set_timeout(
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164 lambda: self.toggle_hide_controls(evt), 300)
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165
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166 def on_double_tap(self, swiper, evt):
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167 evt.stopPropagation()
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168 evt.preventDefault()
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169 if self.click_timer is not None:
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170 timer.clear_timeout(self.click_timer)
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171 self.click_timer = None
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172 if self.swiper.zoom.scale != 1:
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173 self.swiper.zoom.toggle()
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174 else:
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175 # "in" is reserved in Python, so we call it using dict syntax
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176 self.swiper.zoom["in"]()
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177
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178 def on_close(self, evt):
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179 evt.stopPropagation()
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180 evt.preventDefault()
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181 self.quit()
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182
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183 def on_comment_close(self, evt):
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184 side_panel = self.comments_panel_elt.select_one('.comments_side_panel')
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185 side_panel.classList.remove('open')
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186 side_panel.bind("transitionend", lambda evt: self.comments_panel_elt.remove())
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187
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188 def on_comments_panel_click(self, evt):
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189 # we stop stop propagation to avoid the closing of the panel
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190 evt.stopPropagation()
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191
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192 def on_comment(self, evt):
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193 item = self.current_item
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194 if item is None:
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195 return
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196 comments_panel_tpl = Template('blog/comments_panel.html')
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197 try:
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198 comments = item['comments']['items']
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199 except KeyError:
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200 comments = []
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201 self.comments_panel_elt = comments_panel_tpl.get_elt({
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202 "comments": comments,
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203 "comments_service": item['comments_service'],
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204 "comments_node": item['comments_node'],
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205
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206 })
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207 self.slideshow_elt <= self.comments_panel_elt
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208 side_panel = self.comments_panel_elt.select_one('.comments_side_panel')
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209 timer.set_timeout(lambda: side_panel.classList.add("open"), 0)
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210 for close_elt in self.comments_panel_elt.select('.click_to_close'):
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211 close_elt.bind("click", self.on_comment_close)
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212 side_panel.bind("click", self.on_comments_panel_click)