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POQt: scrolling complex content. Web-Browser engine. Selecting a text
 

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  1. POQt: scrolling complex content. Web-Browser engine. Selecting a text
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    <p>Just curious about scrolling complicated content inside web browser - like application. Lets assume i am using Qt and C++. This is not "how to" question, but more like "how does it work"? Completely derived from my curiosity irrational questions.</p> <p>I did small experiment.</p> <ol> <li>Created large QWidget 800x60000 px.</li> <li>Added 300 QWidgets 800x200 px that are painting themselves using QPainter. Each widget prints its unique name to console when paintEvent() is called.</li> <li>Added (1.) to a QScrollArea 800x800.</li> <li>When scrolling, i notice redrawing only widgets that are not fully displayed on the screen. It is only 1 widget at a time (scene: <a href="http://savepic.ru/2670640.jpg" rel="nofollow">http://savepic.ru/2670640.jpg</a>). So QScrollArea (or QWidget? Who deside what widget to repaint?) is smart - we do not have CPU loaded redrawing all the 300 widgets all the time or memory consumption storing 800x60000 pixmap (-;</li> </ol> <p>Lets assume i want to use mouse to select text and other elements on my "webpage". So i want to be able to mark them (by changing background). How would i implement that? How different web browsers do that? Selecting pictures, text, tables... Should i think about tracking the mouse and drawing gray/blue/pink background boxes behind elements and my custom widgets?</p> <p>I have another experiment - displaying stack of messages. The scheme is the same, except QPainter is not used here - only QLabels, QTextExits, QPushButtons (scene: <a href="http://savepic.ru/2632728.jpg" rel="nofollow">http://savepic.ru/2632728.jpg</a>). I can set a flag SelectableByMouse for QLabel, but how do i select more than 1 message?</p> <p>You could suggest me to use some Qt HTML renderer, but this is not the answer for 'how does it work".</p>
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    1. USpavelkolodin
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    1. COI have some loose ideas as to how I would implement this myself, but they're fairly naive and probably not useable in a real-world browser. I suggest you look at the code of QtWebkit instead :)
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      1. POQt: scrolling complex content. Web-Browser engine. Selecting a text
      1. USgnud
    2. COI would spend weeks to understand how it is implemented inside QtWebkit reading its sources.
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      1. POQt: scrolling complex content. Web-Browser engine. Selecting a text
      1. USpavelkolodin
    3. COWell, if you want something simpler, have a look at QTextEdit, which supports text, images and tables. That shouldn't take weeks to look through :)
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      1. POQt: scrolling complex content. Web-Browser engine. Selecting a text
      1. USgnud
 

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