test

digwtx

国家崛起
    最新战报显示，大国的崛起都会经历一个漫长的过程。
http://www.google.com

#!/usr/bin/python
# -*- coding: utf-8 -*-

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from highlighter import MyHighlighter
from highlighter import HighlightingRule

class CodeEditor(QPlainTextEdit):
    '''代码编辑器主类'''

    def __init__(self, parent = None):
        QPlainTextEdit.__init__(self, parent)
        self.lineNumberArea = LineNumberArea(self)
        
        self.connect( \
                self, \
                SIGNAL('blockCountChanged(int)'), \
                self.updateLineNumberAreaWidth \
                )
        self.connect( \
                self, \
                SIGNAL('updateRequest(const QRect &, int)'), \
                self.updateLineNumberArea \
                )
        self.connect( \
                self, \
                SIGNAL('cursorPositionChanged()'), \
                self.highlightCurrentLine \
                )
        
        self.updateLineNumberAreaWidth(0)
        self.highlightCurrentLine()

    def highlightCurrentLine(self):
        '''高亮显示当前行'''
        extraSelections = QTextEdit.extraSelections(QTextEdit())
        if not self.isReadOnly():
            selection = QTextEdit.ExtraSelection()
            lineColor = QColor(Qt.yellow).lighter(160)
            selection.format.setBackground(lineColor)
            selection.format.setProperty( \
                    QTextFormat.FullWidthSelection, \
                    True \
                    )
            selection.cursor = self.textCursor()
            selection.cursor.clearSelection()
            extraSelections.append(selection)
        self.setExtraSelections(extraSelections)

    def lineNumberAreaWidth(self):
        '''计算行号显示区域的宽度'''
        digits = 1
        Max = max(1, self.blockCount())
        while (Max >= 10) :
            Max /= 10
            digits += 1
        space = 3 + self.fontMetrics().width('9') * digits 
        return space

    def updateLineNumberAreaWidth(self, newBlockCount):
        '''更新行号显示区域宽度'''
        self.setViewportMargins( \
                self.lineNumberAreaWidth(), \
                0, \
                0, \
                0 \
                )

    def updateLineNumberArea(self, rect, dy):
        '''更新行号显示区域内容'''
        if dy:
            self.lineNumberArea.scroll(0, dy)
        else:
            self.lineNumberArea.update( \
                    0, \
                    rect.y(), \
                    self.lineNumberAreaWidth(), \
                    rect.height() \
                    )
        if (rect.contains(self.viewport().rect())):
            self.updateLineNumberAreaWidth(0)

    def resizeEvent(self, e):
        '''控件大小改变事件'''
        QPlainTextEdit.resizeEvent(self, e)
        cr = self.contentsRect()
        self.lineNumberArea.setGeometry( \
                QRect(cr.left(), \
                cr.top(), \
                self.lineNumberAreaWidth(), \
                cr.height()) \
                )

    def lineNumberAreaPaintEvent(self, event):
        '''行号改变时触发的事件'''
        painter = QPainter(self.lineNumberArea)
        rect = event.rect()
        painter.fillRect(rect, Qt.lightGray)
        block = self.firstVisibleBlock()
        blockNumber = block.blockNumber()
        top = int(self.blockBoundingGeometry(block).translated( \
                self.contentOffset()).top() \
                )
        bottom = top + int(self.blockBoundingRect(block).height())
        while (block.isValid() and top <= rect.bottom()):
            if (block.isVisible() and bottom >= rect.top()):
                number = QString.number(blockNumber + 1)
                painter.setPen(Qt.black)
                painter.drawText( \
                        0, \
                        top, \
                        self.lineNumberArea.width(), \
                        self.fontMetrics().height(), \
                        Qt.AlignRight, \
                        number \
                        )
            block = block.next()
            top = bottom
            bottom = top + int(self.blockBoundingRect(block).height())
            blockNumber += 1

class LineNumberArea(QWidget):
    '''显示行号的类'''

    def __init__(self, editor):
        QWidget.__init__(self, editor)
        self.codeEditor = editor

    def sizeHint(self):
        return QSize(codeEditor.lineNumberAreaWidth(), 0)

    def paintEvent(self, event):
        self.codeEditor.lineNumberAreaPaintEvent(event)

def main():
    app = QApplication(sys.argv)
    editor = CodeEditor()
    editor.setWindowTitle('Code Editor Example')
    editor.show()
    app.exec_()
    
if __name__ == '__main__':
    main()