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annotate libervia/pages/_browser/slideshow.py @ 1307:0a6698714557

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browser: `slideshow` module implementation: this module show a gallery of slides (usually images/videos) with mobile friendly swipe capabilities. Comments are handled using a side panel.
author Goffi <goffi@goffi.org>
date Thu, 16 Jul 2020 09:08:50 +0200
parents
children 9344ca3b21a6
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rev   line source
1307
0a6698714557 browser: `slideshow` module implementation:
Goffi <goffi@goffi.org>
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1 from browser import document, window, 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
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15 @property
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16 def current_slide(self):
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17 if self.swiper is None:
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18 return None
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19 try:
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20 return DOMNode(self.swiper.slides[self.swiper.realIndex])
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21 # getting missing item in JS arrays returns KeyError
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22 except KeyError:
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23 return None
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24
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25 @property
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26 def current_item(self):
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27 """item attached to the current slide, if any"""
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28 current = self.current_slide
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29 if current is None:
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30 return
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31 try:
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32 return current.js._item
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33 except AttributeError:
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34 return None
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35
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36 @property
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37 def index(self):
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38 if self.swiper is None:
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39 return None
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40 return self.swiper.realIndex
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41
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42 @index.setter
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43 def index(self, idx):
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44 if self.swiper is not None:
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45 self.swiper.slideTo(idx, 0)
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46
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47 def attach(self):
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48 document.body <= self.slideshow_elt
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49 self.swiper = Swiper.new(
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50 ".swiper-container",
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51 {
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52 "pagination": {
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53 "el": ".swiper-pagination",
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54 },
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55 "navigation": {
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56 "nextEl": ".swiper-button-next",
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57 "prevEl": ".swiper-button-prev",
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58 "hideOnClick": True,
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59 },
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60 "scrollbar": {
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61 "el": ".swiper-scrollbar",
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62 },
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63 "grabCursor": True,
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64 "keyboard": {
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65 "enabled": True,
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66 "onlyInViewport": False,
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67 },
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68 "mousewheel": True,
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69 }
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70 )
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71 window.addEventListener("keydown", self.on_key_down, True)
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72 self.slideshow_elt.select_one(".click_to_close").bind("click", self.on_close)
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73 self.slideshow_elt.select_one(".click_to_comment").bind("click", self.on_comment)
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74 self.swiper.on("slideChange", self.on_slide_change)
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75 self.on_slide_change()
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76
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77 def add_slide(self, slide_elt):
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78 self.swiper.appendSlide([slide_elt])
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79 self.swiper.update()
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80
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81 def quit(self):
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82 self.slideshow_elt.remove()
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83 self.slideshow_elt = None
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84 self.swiper.destroy(True, True)
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85 self.swiper = None
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86
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87 def on_key_down(self, evt):
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88 if evt.key == 'Escape':
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89 self.quit()
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90 else:
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91 return
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92 evt.preventDefault()
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93
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94 def on_slide_change(self):
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95 item = self.current_item
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96 if item is None:
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97 return
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98 comments_count = item.get('comments_count')
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99 self.comments_count_elt.text = comments_count or ''
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100
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101 def on_close(self, evt):
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102 evt.stopPropagation()
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103 evt.preventDefault()
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104 self.quit()
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105
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106 def on_comment_close(self, evt):
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107 side_panel = self.comments_panel_elt.select_one('.comments_side_panel')
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108 side_panel.classList.remove('open')
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109 side_panel.bind("transitionend", lambda evt: self.comments_panel_elt.remove())
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110
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111 def on_comments_panel_click(self, evt):
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112 # we stop stop propagation to avoid the closing of the panel
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113 evt.stopPropagation()
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114
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115 def on_comment(self, evt):
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116 item = self.current_item
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117 if item is None:
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118 return
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119 comments_panel_tpl = Template('blog/comments_panel.html')
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120 try:
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121 comments = item['comments']['items']
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122 except KeyError:
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123 comments = []
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124 self.comments_panel_elt = comments_panel_tpl.get_elt({
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125 "comments": comments,
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126 "comments_service": item['comments_service'],
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127 "comments_node": item['comments_node'],
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128
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129 })
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130 document.body <= self.comments_panel_elt
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131 side_panel = self.comments_panel_elt.select_one('.comments_side_panel')
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132 window.setTimeout(lambda: side_panel.classList.add("open"))
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133 for close_elt in self.comments_panel_elt.select('.click_to_close'):
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134 close_elt.bind("click", self.on_comment_close)
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135 side_panel.bind("click", self.on_comments_panel_click)