使用PySide和的QTextEdit（版本2）

Question

半透明亮點我試圖使semi-transparent highlights使用列表爲一個更完整的示例：

（1）聚合的R，G，B，A，並突出顯示計數（五個列表）

（2）平均的R，G，B，A（四個列表）

在平均列表中的值獲得分配爲背景色。聚合列表用於通過添加和減去高亮顏色來計算平均值。每個列表都有與文本小部件中的字符一樣多的元素。

我正在使用一個熊貓數據框在內存中存儲高亮，因爲可能有很多它們以各種方式以及其他數據最終處理。將鼠標放在字符上可以打印出它的位置，亮點數量和RGBA值。除了有時會彈出一個問題 - 就像從一個高光位置移動到另一個高光位置時，畫筆被拖動一秒鐘一樣。查看文本「PySide.QtCore」末尾「e」處的綠松石顏色。我認爲問題在於我如何使用設置和移動光標的位置 - 但我不確定。添加每個突出顯示後，是否需要重置光標的位置？我沒有正確選擇單個字符嗎？

import sys 
import pandas as pd 
import sqlite3 
from PySide.QtCore import * 
from PySide.QtGui import * 

def connect_database(db_file): 
    try: 
     conn = sqlite3.connect(db_file) 
     return conn 
    except Error as e: 
     print(e) 
     return None 

def create_data(connection): # database connection 
    c = connection.cursor() # database cursor 
    c.execute("CREATE TABLE sections(id INTEGER PRIMARY KEY, start INTEGER, end INTEGER, r INTEGER, g INTEGER, b INTEGER, a INTEGER)") 
    c.execute("INSERT INTO sections VALUES(1,0,20,100,200,100,100)") 
    c.execute("INSERT INTO sections VALUES(2,15,20,200,100,100,50)") 
    c.execute("INSERT INTO sections VALUES(3,18,30,100,100,200,100)") 
    c.execute("INSERT INTO sections VALUES(4,50,60,100,200,200,150)") 
    db.commit() 
    return c.lastrowid 


class QTextEdit2(QTextEdit): 

    def __init__(self, parent=None): 
     super().__init__(parent) 
     self.setMouseTracking(True) 
     self.cursor = self.textCursor() 

     self.length = len(self.toPlainText()) 
     self.bg_red = [0 for n in range(self.length)] # stores aggregate values of all highlights (not averages) 
     self.bg_green = [0 for n in range(self.length)] 
     self.bg_blue = [0 for n in range(self.length)] 
     self.bg_alpha = [0 for n in range(self.length)] 
     self.bg_count = [0 for n in range(self.length)] # number of highlights. if this is 0 then don't display 
                 # stored r,g,b just display white. in this example 
                 # only highlights are written. everything else stays 
                 # default 

     self.display_red = [0 for n in range(self.length)] # set to the value to display (average of highlights) 
     self.display_green = [0 for n in range(self.length)] 
     self.display_blue = [0 for n in range(self.length)] 
     self.display_alpha = [0 for n in range(self.length)] 

     self.sections = self.load_sections() 
     self.color_sections() 

    def mouseMoveEvent(self, event): 
     point = QPoint() 
     x = event.x() 
     y = event.y() 
     point.setX(x) 
     point.setY(y) 
     n = self.cursorForPosition(point).position() 
     print("%d: Section Count: %d RGBA: %d %d %d %d" % (n, self.bg_count[n],self.display_red[n], self.display_green[n],self.display_blue[n], self.display_alpha[n])) 
     super().mouseMoveEvent(event) 


    def load_sections(self): 
     c = sqlite3.connect("qda_test_01.sqlite") 
     df = pd.read_sql_query("SELECT * FROM sections", c) 
     return df 


    def blend_colors(self, start, end, r, g, b, a): 
     for n in range(start,end): 
      self.bg_red[n] = self.bg_red[n]+r 
      self.bg_green[n] = self.bg_green[n]+g 
      self.bg_blue[n] = self.bg_blue[n]+b 
      self.bg_alpha[n] = self.bg_alpha[n]+a 
      self.bg_count[n] = self.bg_count[n]+1 
      self.display_red[n] = self.bg_red[n]/self.bg_count[n] 
      self.display_green[n] = self.bg_green[n]/self.bg_count[n] 
      self.display_blue[n] = self.bg_blue[n]/self.bg_count[n] 
      self.display_alpha[n] = self.bg_alpha[n]/self.bg_count[n] 
      if self.display_red[n] > 255: # just in case RGBA data is weird... 
       self.display_red[n] = 255 
      if self.display_green[n] > 255: 
       self.display_green[n] = 255 
      if self.display_blue[n] > 255: 
       self.display_blue[n] = 255 
      if self.display_alpha[n] > 255: 
       self.display_alpha[n] = 255 
      if self.display_red[n] < 0: 
       self.display_red[n] = 0 
      if self.display_green[n] < 0: 
       self.display_green[n] = 0 
      if self.display_blue[n] < 0: 
       self.display_blue[n] = 0 
      if self.display_alpha[n] < 0: 
       self.display_alpha[n] = 0 

      print("LOCATION: %d | SECTION:  r:%d g:%g b:%d  a:%d  | DISPLAY:  r:%d g:%g b:%d  a:%d" % (n,self.bg_red[n],self.bg_green[n],self.bg_blue[n],self.bg_alpha[n],self.display_red[n],self.display_green[n],self.display_blue[n],self.display_alpha[n])) 

      color = QColor(self.display_red[n], self.display_green[n], self.display_blue[n]) 
      color.setAlpha(self.display_alpha[n]) 
      cursor = self.textCursor() 
      cursor.setPosition(n) 
      cursor.movePosition(QTextCursor.NextCharacter, QTextCursor.KeepAnchor, 1) 
      charfmt = cursor.charFormat() 
      charfmt.setBackground(color) 
      self.setCurrentCharFormat(charfmt) 
      self.setTextCursor(cursor) 


    def color_sections(self): 
     for n in range(self.sections.id.count()): 
      print("-----SECTION:%d-----" % (n)) 
      section = self.sections.iloc[n] 
      self.blend_colors(section.start, section.end, section.r, section.g, section.b, section.a) 



if __name__ == '__main__': 

    # Create database and sections to highlight 
    fn='qda_test_01.sqlite' 
    db=connect_database(fn) 
    id=create_data(db) 
    db.close() 

    app = QApplication(sys.argv) 
    window = QTextEdit2(
     "In addition, the PySide.QtCore.QPoint class provides the PySide.QtCore.QPoint.manhattanLength() function which gives an inexpensive approximation of the length of the PySide.QtCore.QPoint object interpreted as a vector. Finally, PySide.QtCore.QPoint objects can be streamed as well as compared.") 
    window.show() 
    sys.exit(app.exec_()) 

Answer 1

如果你在我的previous answer用我給你的代碼，目前的例子就是正常工作。實際上，您的更改引入了大量逐個錯誤。

要調試這個，你應該首先檢查確切地看到應該突出顯示哪些文本塊。以文本並從數據庫中開始/結束值的前65個字符，這給：

>>> t = "In addition, the PySide.QtCore.QPoint class provides the PySide." 
>>> t[0:20] 
'In addition, the PyS' 
>>> t[15:20] 
'e PyS' 
>>> t[18:30] 
'ySide.QtCore' 
>>> t[50:60] 
'es the PyS' 

如果你比較這對實際產出的亮點，你會看到，沒有任何部分匹配（例如，在每個「PySide」中查看「S」）。

爲了得到這個正常工作，你必須在一開始獲得的文本光標一次，用它來進行所有必要的修改，然後重新設置末一次：

cursor = self.textCursor() 
for n in range(start, end): 
    ... 
    cursor.setPosition(n) 
    cursor.movePosition(QTextCursor.NextCharacter, QTextCursor.KeepAnchor) 
    charfmt = cursor.charFormat() 
    charfmt.setBackground(color) 
    cursor.setCharFormat(charfmt) 
cursor.clearSelection() 
self.setTextCursor(cursor) 

這與更新數據庫類似：您使用遊標來安排一系列更改，然後在最後將其作爲單個操作進行提交。