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160
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1 #!/usr/bin/python
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2
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3 import sys
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4 from PyQt4.QtCore import *
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5 from PyQt4.QtGui import *
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6 import inspect
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7
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8 GAP = 5
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9
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10 def clipVal(v, mn, mx):
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11 if v < mn: return mn
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12 if v > mx: return mx
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13 return v
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14
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15 class InnerCode(QWidget):
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16 def __init__(self, scrollArea):
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17 super().__init__(scrollArea)
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18 self.scrollArea = scrollArea
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19 self.setFont(QFont('Courier', 16))
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20 self.setFocusPolicy(Qt.StrongFocus)
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21 self.blinkcursor = False
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22 # Initial values:
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23 self.setSource('')
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24 self.CursorPosition = 0
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25 t = QTimer(self)
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26 t.timeout.connect(self.updateCursor)
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27 t.setInterval(500)
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28 t.start()
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29 def updateCursor(self):
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30 self.blinkcursor = not self.blinkcursor
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31 self.update(self.cursorX, self.cursorY, self.charWidth, self.charHeight)
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32 def setSource(self, src):
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33 self.src = src
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34 self.adjust()
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35 def setCursorPosition(self, c):
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36 self.cursorPosition = clipVal(c, 0, len(self.src))
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37 self.cursorX = self.CursorCol * self.charWidth + self.xposTXT - self.charWidth
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38 self.cursorY = self.CursorRow * self.charHeight - self.charHeight
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161
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39 self.update()
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160
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40 CursorPosition = property(lambda self: self.cursorPosition, setCursorPosition)
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41 @property
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161
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42 def Rows(self):
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43 # Make this nicer:
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44 return self.src.split('\n')
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45 @property
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160
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46 def CursorRow(self):
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47 # TODO: make this nice.
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48 txt = self.src[0:self.cursorPosition]
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49 return len(txt.split('\n'))
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50 @property
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51 def CursorCol(self):
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52 txt = self.src[0:self.cursorPosition]
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53 curLine = txt.split('\n')[-1]
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54 return len(curLine) + 1
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55 @property
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56 def CurrentLine(self):
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57 return self.getRow(self.CursorRow)
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161
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58 def setRowCol(self, r, c):
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59 prevRows = self.Rows[:r]
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60 txt = '\n'.join(prevRows)
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61 self.CursorPosition = len(txt) + c
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160
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62 def getRow(self, r):
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161
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63 rows = self.Rows
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160
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64 r = r - 1
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65 if r < 0 or r > len(rows) - 1:
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66 return ''
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67 else:
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68 return rows[r]
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69 def getChar(self, pos):
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70 pass
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71 def insertText(self, txt):
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72 self.setSource(self.src[0:self.CursorPosition] + txt + self.src[self.CursorPosition:])
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73 self.CursorPosition += len(txt)
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161
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74 def deleteChar(self):
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75 self.setSource(self.src[0:self.CursorPosition] + self.src[self.CursorPosition+1:])
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160
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76 def GotoNextChar(self):
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77 if self.src[self.CursorPosition] != '\n':
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78 self.CursorPosition += 1
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79 def GotoPrevChar(self):
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80 if self.src[self.CursorPosition - 1] != '\n':
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81 self.CursorPosition -= 1
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82 def GotoNextLine(self):
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83 curLine = self.CurrentLine
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84 c = self.CursorCol
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161
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85 self.CursorPosition += len(curLine) - c + 1 # line break char!
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160
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86 curLine = self.CurrentLine
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161
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87 if len(curLine) < c:
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88 self.CursorPosition += len(curLine)
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89 else:
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90 self.CursorPosition += c
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91 def GotoPrevLine(self):
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160
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92 c = self.CursorCol
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161
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93 self.CursorPosition -= c + 1 # line break char!
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94 curLine = self.CurrentLine
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95 if len(curLine) > c:
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96 self.CursorPosition -= len(curLine) - c
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160
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97 def paintEvent(self, event):
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98 # Helper variables:
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99 er = event.rect()
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100 chw, chh = self.charWidth, self.charHeight
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101 painter = QPainter(self)
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102 # Background:
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103 painter.fillRect(er, self.palette().color(QPalette.Base))
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104 painter.fillRect(QRect(self.xposLNA, er.top(), 8 * chw, er.bottom() + 1), Qt.gray)
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161
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105 painter.fillRect(er.left(), (self.CursorRow - 1) * chh, er.width(), chh, Qt.yellow)
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160
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106 painter.setPen(Qt.gray)
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107 # first and last row:
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161
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108 row1 = max(int(er.top() / chh) - 1, 1)
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109 row2 = max(int(er.bottom() / chh) + 1, 1)
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160
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110 # Draw contents:
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111 for row in range(row1, row2 + 1):
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161
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112 ypos = row * chh - self.charDescent
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160
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113 painter.setPen(Qt.black)
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114 painter.drawText(self.xposLNA, ypos, 'R ={0}'.format(row))
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115 xpos = self.xposTXT
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161
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116 painter.drawText(xpos, ypos, self.getRow(row))
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160
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117 # cursor
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118 if self.blinkcursor:
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119 painter.fillRect(self.cursorX, self.cursorY, 2, chh, Qt.black)
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120 def keyPressEvent(self, event):
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121 if event.matches(QKeySequence.MoveToNextChar):
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122 self.GotoNextChar()
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161
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123 elif event.matches(QKeySequence.MoveToPreviousChar):
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160
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124 self.GotoPrevChar()
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161
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125 elif event.matches(QKeySequence.MoveToNextLine):
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160
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126 self.GotoNextLine()
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161
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127 elif event.matches(QKeySequence.MoveToPreviousLine):
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160
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128 self.GotoPrevLine()
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161
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129 elif event.matches(QKeySequence.MoveToNextPage):
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160
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130 for i in range(5):
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131 self.GotoNextLine()
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161
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132 elif event.matches(QKeySequence.MoveToPreviousPage):
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160
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133 for i in range(5):
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134 self.GotoPrevLine()
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161
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135 elif event.matches(QKeySequence.MoveToEndOfLine):
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160
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136 self.CursorPosition += len(self.CurrentLine) - self.CursorCol + 1
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161
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137 elif event.matches(QKeySequence.MoveToStartOfLine):
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160
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138 self.CursorPosition -= self.CursorCol - 1
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161
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139 elif event.matches(QKeySequence.Delete):
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140 self.deleteChar()
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141 elif event.matches(QKeySequence.InsertParagraphSeparator):
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142 self.insertText('\n')
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143 elif event.key() == Qt.Key_Backspace:
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144 self.CursorPosition -= 1
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145 self.deleteChar()
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146 else:
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147 char = event.text()
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148 if char:
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149 self.insertText(char)
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160
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150 self.update()
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161
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151 def mousePressEvent(self, event):
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152 pos = event.pos()
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153 if pos.x() > self.xposTXT and pos.x():
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154 c = round((pos.x() - self.xposTXT) / self.charWidth)
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155 r = int(pos.y() / self.charHeight)
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156 self.setRowCol(r, c)
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160
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157 def adjust(self):
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161
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158 metrics = self.fontMetrics()
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159 self.charHeight = metrics.height()
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160 self.charWidth = metrics.width('x')
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161 self.charDescent = metrics.descent()
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160
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162 self.xposLNA = GAP
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163 self.xposTXT = self.xposLNA + 8 * self.charWidth + GAP
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164 self.xposEnd = self.xposTXT + self.charWidth * 80
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165 self.setMinimumWidth(self.xposEnd)
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166 txt = self.src.split('\n')
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167 self.setMinimumHeight(self.charHeight * len(txt))
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168 self.update()
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169
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170 class CodeEdit(QScrollArea):
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171 def __init__(self):
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172 super().__init__()
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173 self.ic = InnerCode(self)
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174 self.setWidget(self.ic)
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175 self.setWidgetResizable(True)
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176 self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
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177 self.setFocusPolicy(Qt.NoFocus)
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178 Source = property(lambda s: s.ic.getSource(), lambda s, v: s.ic.setSource(v))
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179
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180 if __name__ == '__main__':
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181 app = QApplication(sys.argv)
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182 ce = CodeEdit()
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183 ce.show()
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184 src = ''.join(inspect.getsourcelines(InnerCode)[0])
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185 ce.Source = src
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161
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186 ce.resize(600, 800)
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160
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187 app.exec()
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188
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