eric6/HexEdit/HexEditUndoStack.py

Sat, 27 Feb 2021 12:08:23 +0100

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 27 Feb 2021 12:08:23 +0100
changeset 8138
169e65a6787c
parent 7923
91e843545d9a
child 8218
7c09585bd960
permissions
-rw-r--r--

Shell: added functionality to show a prompt when the main client process has exited (e.g. a script ended).

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2016 - 2021 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 the Undo stack for the hex edit widget.
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8 """
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9
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10 from enum import Enum
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11
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12 from PyQt5.QtWidgets import QUndoStack, QUndoCommand
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13
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14
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15 class HexEditCommand(Enum):
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16 """
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17 Class implementing the edit comands.
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18 """
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19 Insert = 0
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20 RemoveAt = 1
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21 Overwrite = 2
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22
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23
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24 class HexEditUndoCommand(QUndoCommand):
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25 """
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26 Class implementing the Undo command.
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27 """
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28 def __init__(self, chunks, cmd, pos, newByte, parent=None):
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29 """
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30 Constructor
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31
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32 @param chunks reference to the data container
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33 @type HexEditChunks
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34 @param cmd edit command
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35 @type HexEditCommand
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36 @param pos edit position
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37 @type int
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38 @param newByte new byte value
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39 @type int (range 0 to 255)
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40 @param parent reference to the parent command
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41 @type QUndoCommand
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42 """
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43 super(HexEditUndoCommand, self).__init__(parent)
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44
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45 self.__chunks = chunks
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46 self._pos = pos
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47 self._newByte = newByte
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48 self._cmd = cmd
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49
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50 self.__wasChanged = False
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51 self.__oldByte = 0
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52
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53 def undo(self):
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54 """
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55 Public method to undo the command.
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56 """
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57 if self._cmd == HexEditCommand.Insert:
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58 self.__chunks.removeAt(self._pos)
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59 elif self._cmd == HexEditCommand.Overwrite:
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60 self.__chunks.overwrite(self._pos, self.__oldByte)
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61 self.__chunks.setDataChanged(self._pos, self.__wasChanged)
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62 elif self._cmd == HexEditCommand.RemoveAt:
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63 self.__chunks.insert(self._pos, self.__oldByte)
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64 self.__chunks.setDataChanged(self._pos, self.__wasChanged)
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65
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66 def redo(self):
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67 """
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68 Public method to redo the command.
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69 """
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70 if self._cmd == HexEditCommand.Insert:
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71 self.__chunks.insert(self._pos, self._newByte)
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72 elif self._cmd == HexEditCommand.Overwrite:
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73 self.__oldByte = self.__chunks[self._pos]
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74 self.__wasChanged = self.__chunks.dataChanged(self._pos)
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75 self.__chunks.overwrite(self._pos, self._newByte)
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76 elif self._cmd == HexEditCommand.RemoveAt:
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77 self.__oldByte = self.__chunks[self._pos]
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78 self.__wasChanged = self.__chunks.dataChanged(self._pos)
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79 self.__chunks.removeAt(self._pos)
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80
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81 def mergeWith(self, command):
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82 """
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83 Public method to merge this command with another one.
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84
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85 @param command reference to the command to merge with
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86 @type QUndoCommand
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87 @return flag indicating a successful merge
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88 @rtype bool
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89 """
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90 result = False
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91
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92 if self._cmd != HexEditCommand.RemoveAt:
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93 if command._cmd == HexEditCommand.Overwrite:
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94 if command._pos == self._pos:
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95 self._newByte = command._newByte
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96 result = True
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97
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98 return result
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99
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100 def id(self):
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101 """
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102 Public method to get the ID of this undo command class.
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103
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104 @return ID of the undo command class
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105 @rtype int
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106 """
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107 return 4242
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108
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109
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110 class HexEditUndoStack(QUndoStack):
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111 """
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112 Class implementing an Undo stack for the hex edit widget.
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113 """
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114 def __init__(self, chunks, parent=None):
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115 """
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116 Constructor
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117
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118 @param chunks reference to the data container
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119 @type HexEditChunks
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120 @param parent reference to the parent object
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121 @type QObject
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122 """
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123 super(HexEditUndoStack, self).__init__(parent)
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124
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125 self.__chunks = chunks
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126 self.__parent = parent
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127
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128 def insert(self, pos, data):
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129 """
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130 Public method to insert a byte.
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131
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132 @param pos position to insert at
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133 @type int
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134 @param data byte to be inserted
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135 @type int (range 0 to 255)
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136 """
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137 if pos >= 0 and pos <= self.__chunks.size():
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138 uc = HexEditUndoCommand(
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139 self.__chunks, HexEditCommand.Insert, pos, data)
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140 self.push(uc)
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141
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142 def insertByteArray(self, pos, byteArray):
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143 """
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144 Public method to insert bytes.
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145
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146 @param pos position to insert at
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147 @type int
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148 @param byteArray data to be inserted
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149 @type byteArray or QByteArray
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150 """
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151 ba = bytearray(byteArray)
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152
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153 if pos >= 0 and pos <= self.__chunks.size():
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154 txt = self.tr("Inserting %n byte(s)", "", len(ba))
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155 self.beginMacro(txt)
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156 for idx in range(len(ba)):
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157 uc = HexEditUndoCommand(
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158 self.__chunks, HexEditCommand.Insert, pos + idx, ba[idx])
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159 self.push(uc)
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160 self.endMacro()
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161
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162 def removeAt(self, pos, length=1):
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163 """
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164 Public method to remove bytes.
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165
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166 @param pos position to remove bytes from
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167 @type int
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168 @param length amount of bytes to remove
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169 @type int
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170 """
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171 if pos >= 0 and pos <= self.__chunks.size():
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172 if length == 1:
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173 uc = HexEditUndoCommand(
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174 self.__chunks, HexEditCommand.RemoveAt, pos, 0)
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175 self.push(uc)
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176 else:
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177 txt = self.tr("Deleting %n byte(s)", "", length)
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178 self.beginMacro(txt)
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179 for _cnt in range(length):
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180 uc = HexEditUndoCommand(
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181 self.__chunks, HexEditCommand.RemoveAt, pos, 0)
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182 self.push(uc)
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183 self.endMacro()
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184
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185 def overwrite(self, pos, data):
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186 """
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187 Public method to replace a byte.
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188
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189 @param pos position to replace the byte at
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190 @type int
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191 @param data byte to replace with
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192 @type int (range 0 to 255)
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193 """
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194 if pos >= 0 and pos <= self.__chunks.size():
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195 uc = HexEditUndoCommand(
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196 self.__chunks, HexEditCommand.Overwrite, pos, data)
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197 self.push(uc)
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198
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199 def overwriteByteArray(self, pos, length, byteArray):
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200 """
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201 Public method to replace bytes.
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202
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203 @param pos position to replace the bytes at
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204 @type int
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205 @param length amount of bytes to replace
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206 @type int
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207 @param byteArray bytes to replace with
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208 @type bytearray or QByteArray
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209 """
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210 ba = bytearray(byteArray)
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211
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212 if pos >= 0 and pos <= self.__chunks.size():
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213 txt = self.tr("Inserting %n byte(s)", "", len(ba))
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214 self.beginMacro(txt)
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215 self.removeAt(pos, length)
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216 self.insertByteArray(pos, ba)
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217 self.endMacro()

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