Network/IRC/IrcMessageEdit.py

Wed, 02 Jan 2013 10:31:48 +0100

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Wed, 02 Jan 2013 10:31:48 +0100
changeset 2302
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parent 2255
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child 2525
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child 2960
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child 3163
9f50365a0870
permissions
-rw-r--r--

Updated copyright for 2013.

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1 # -*- coding: utf-8 -*-
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2
2302
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3 # Copyright (c) 2012 - 2013 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing a specialized line edit for entering IRC messages.
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8 """
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9
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10 from PyQt4.QtCore import Qt
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11
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12 from E5Gui.E5LineEdit import E5LineEdit, E5ClearableLineEdit
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13
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14
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15 class IrcMessageEdit(E5ClearableLineEdit):
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16 """
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17 Class implementing a specialized line edit for entering IRC messages.
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18 """
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19 MaxHistory = 100
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20
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21 def __init__(self, parent=None, inactiveText="", side=E5LineEdit.RightSide):
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22 """
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23 Constructor
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24
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25 @param parent reference to the parent widget (QWidget)
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26 @keyparam inactiveText text to be shown on inactivity (string)
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27 @keyparam side side the clear button should be shown at (E5LineEdit.RightSide,
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28 E5LineEdit.LeftSide)
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29 """
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30 super().__init__(parent, inactiveText, side)
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31
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32 self.__historyList = [""] # initialize with one empty line
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33 self.__historyLine = 0
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34
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35 def setText(self, text):
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36 """
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37 Public method to set the text.
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38
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39 Note: This reimplementation ensures, that the cursor is at the end of the text.
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40
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41 @param text text to be set (string)
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42 """
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43 super().setText(text)
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44 self.setCursorPosition(len(text))
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45
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46 def keyPressEvent(self, evt):
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47 """
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48 Protected method implementing special key handling.
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49
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50 @param evt reference to the event (QKeyEvent)
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51 """
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52 key = evt.key()
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53 if key == Qt.Key_Up:
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54 self.__getHistory(True)
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55 return
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56 elif key == Qt.Key_Down:
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57 self.__getHistory(False)
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58 return
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59 elif key in [Qt.Key_Return, Qt.Key_Enter]:
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60 if self.text():
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61 self.__addHistory(self.text())
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62 elif evt.text() == chr(21):
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63 # ^U: clear the text
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64 self.setText("")
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65
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66 super().keyPressEvent(evt)
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67
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68 def wheelEvent(self, evt):
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69 """
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70 Protected slot to support wheel events.
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71
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72 @param reference to the wheel event (QWheelEvent)
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73 """
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74 if evt.delta() > 0:
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75 self.__getHistory(True)
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76 elif evt.delta() < 0:
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77 self.__getHistory(False)
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78
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79 super().wheelEvent(evt)
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80
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81 def __addHistory(self, txt):
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82 """
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83 Private method to add an entry to the history.
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84
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85 @param txt text to be added to the history (string)
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86 """
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87 # Only add the entry, if it is not the same as last time
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88 if len(self.__historyList) == 1 or \
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89 (len(self.__historyList) > 1 and self.__historyList[1] != txt):
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90 # Replace empty first entry and add new empty first entry
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91 self.__historyList[0] = txt
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92 self.__historyList.insert(0, "")
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93 # Keep history below the defined limit
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94 del self.__historyList[IrcMessageEdit.MaxHistory:]
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95
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96 self.__historyLine = 0
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97
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98 def __getHistory(self, up):
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99 """
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100 Private method to move in the history.
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101
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102 @param up flag indicating the direction (boolean)
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103 """
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104 # preserve the current text, if it is not empty
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105 if self.text():
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106 self.__historyList[self.__historyLine] = self.text()
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107
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108 if up:
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109 self.__historyLine += 1
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110 # If the position was moved past the end of the history, go to the last entry
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111 if self.__historyLine == len(self.__historyList):
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112 self.__historyLine -= 1
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113 return
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114 else:
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115 # If the position is at the top of the history, arrow-down shall add the text
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116 # to the history and clear the line edit for new input
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117 if self.__historyLine == 0:
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118 if self.text():
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
119 self.__addHistory(self.text())
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
120 self.setText("")
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
121 else:
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
122 # If the position is not at the top of the history, decrement it
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
123 self.__historyLine -= 1
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
124
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
125 # replace the text of the line edit with the selected history entry
3e728bfc178c Added a specialized line edit for entering IRC messages, which supports a non-persistent edit history.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
126 self.setText(self.__historyList[self.__historyLine])

eric ide

mercurial