Mercurial > cpython-lru_cache-weakref

annotate Lib/idlelib/CallTipWindow.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents af1f8adc913b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """A CallTip window class for Tkinter/IDLE.
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2
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3 After ToolTip.py, which uses ideas gleaned from PySol
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4 Used by the CallTips IDLE extension.
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5
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6 """
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7 from Tkinter import *
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8
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9 HIDE_VIRTUAL_EVENT_NAME = "<<calltipwindow-hide>>"
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10 HIDE_SEQUENCES = ("<Key-Escape>", "<FocusOut>")
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11 CHECKHIDE_VIRTUAL_EVENT_NAME = "<<calltipwindow-checkhide>>"
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12 CHECKHIDE_SEQUENCES = ("<KeyRelease>", "<ButtonRelease>")
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13 CHECKHIDE_TIME = 100 # miliseconds
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14
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15 MARK_RIGHT = "calltipwindowregion_right"
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16
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17 class CallTip:
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18
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19 def __init__(self, widget):
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20 self.widget = widget
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21 self.tipwindow = self.label = None
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22 self.parenline = self.parencol = None
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23 self.lastline = None
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24 self.hideid = self.checkhideid = None
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25 self.checkhide_after_id = None
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26
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27 def position_window(self):
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28 """Check if needs to reposition the window, and if so - do it."""
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29 curline = int(self.widget.index("insert").split('.')[0])
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30 if curline == self.lastline:
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31 return
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32 self.lastline = curline
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33 self.widget.see("insert")
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34 if curline == self.parenline:
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35 box = self.widget.bbox("%d.%d" % (self.parenline,
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36 self.parencol))
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37 else:
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38 box = self.widget.bbox("%d.0" % curline)
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39 if not box:
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40 box = list(self.widget.bbox("insert"))
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41 # align to left of window
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42 box[0] = 0
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43 box[2] = 0
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44 x = box[0] + self.widget.winfo_rootx() + 2
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45 y = box[1] + box[3] + self.widget.winfo_rooty()
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46 self.tipwindow.wm_geometry("+%d+%d" % (x, y))
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47
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48 def showtip(self, text, parenleft, parenright):
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49 """Show the calltip, bind events which will close it and reposition it.
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50 """
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51 # truncate overly long calltip
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52 if len(text) >= 79:
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53 textlines = text.splitlines()
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54 for i, line in enumerate(textlines):
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55 if len(line) > 79:
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56 textlines[i] = line[:75] + ' ...'
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57 text = '\n'.join(textlines)
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58 self.text = text
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59 if self.tipwindow or not self.text:
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60 return
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61
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62 self.widget.mark_set(MARK_RIGHT, parenright)
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63 self.parenline, self.parencol = map(
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64 int, self.widget.index(parenleft).split("."))
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65
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66 self.tipwindow = tw = Toplevel(self.widget)
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67 self.position_window()
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68 # remove border on calltip window
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69 tw.wm_overrideredirect(1)
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70 try:
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71 # This command is only needed and available on Tk >= 8.4.0 for OSX
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72 # Without it, call tips intrude on the typing process by grabbing
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73 # the focus.
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74 tw.tk.call("::tk::unsupported::MacWindowStyle", "style", tw._w,
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75 "help", "noActivates")
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76 except TclError:
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77 pass
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78 self.label = Label(tw, text=self.text, justify=LEFT,
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79 background="#ffffe0", relief=SOLID, borderwidth=1,
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80 font = self.widget['font'])
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81 self.label.pack()
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82
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83 self.checkhideid = self.widget.bind(CHECKHIDE_VIRTUAL_EVENT_NAME,
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84 self.checkhide_event)
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85 for seq in CHECKHIDE_SEQUENCES:
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86 self.widget.event_add(CHECKHIDE_VIRTUAL_EVENT_NAME, seq)
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87 self.widget.after(CHECKHIDE_TIME, self.checkhide_event)
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88 self.hideid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME,
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89 self.hide_event)
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90 for seq in HIDE_SEQUENCES:
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91 self.widget.event_add(HIDE_VIRTUAL_EVENT_NAME, seq)
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92
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93 def checkhide_event(self, event=None):
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94 if not self.tipwindow:
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95 # If the event was triggered by the same event that unbinded
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96 # this function, the function will be called nevertheless,
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97 # so do nothing in this case.
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98 return
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99 curline, curcol = map(int, self.widget.index("insert").split('.'))
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100 if curline < self.parenline or \
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101 (curline == self.parenline and curcol <= self.parencol) or \
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102 self.widget.compare("insert", ">", MARK_RIGHT):
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103 self.hidetip()
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104 else:
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105 self.position_window()
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106 if self.checkhide_after_id is not None:
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107 self.widget.after_cancel(self.checkhide_after_id)
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108 self.checkhide_after_id = \
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109 self.widget.after(CHECKHIDE_TIME, self.checkhide_event)
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110
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111 def hide_event(self, event):
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112 if not self.tipwindow:
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113 # See the explanation in checkhide_event.
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114 return
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115 self.hidetip()
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116
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117 def hidetip(self):
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118 if not self.tipwindow:
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119 return
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120
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121 for seq in CHECKHIDE_SEQUENCES:
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122 self.widget.event_delete(CHECKHIDE_VIRTUAL_EVENT_NAME, seq)
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123 self.widget.unbind(CHECKHIDE_VIRTUAL_EVENT_NAME, self.checkhideid)
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124 self.checkhideid = None
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125 for seq in HIDE_SEQUENCES:
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126 self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq)
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127 self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideid)
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128 self.hideid = None
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129
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130 self.label.destroy()
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131 self.label = None
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132 self.tipwindow.destroy()
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133 self.tipwindow = None
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134
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135 self.widget.mark_unset(MARK_RIGHT)
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136 self.parenline = self.parencol = self.lastline = None
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137
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138 def is_active(self):
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139 return bool(self.tipwindow)
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140
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141
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142
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143 ###############################
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144 #
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145 # Test Code
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146 #
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147 class container: # Conceptually an editor_window
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148 def __init__(self):
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149 root = Tk()
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150 text = self.text = Text(root)
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151 text.pack(side=LEFT, fill=BOTH, expand=1)
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152 text.insert("insert", "string.split")
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153 root.update()
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154 self.calltip = CallTip(text)
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155
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156 text.event_add("<<calltip-show>>", "(")
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157 text.event_add("<<calltip-hide>>", ")")
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158 text.bind("<<calltip-show>>", self.calltip_show)
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159 text.bind("<<calltip-hide>>", self.calltip_hide)
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160
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161 text.focus_set()
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162 root.mainloop()
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163
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164 def calltip_show(self, event):
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165 self.calltip.showtip("Hello world")
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166
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167 def calltip_hide(self, event):
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168 self.calltip.hidetip()
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169
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170 def main():
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171 # Test code
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172 c=container()
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173
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174 if __name__=='__main__':
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175 main()