Gtkmm - “Gtk :: DrawingArea”在“Gtk :: ScrolledWindow”？ [英] Gtkmm - "Gtk::DrawingArea" in "Gtk::ScrolledWindow"?

问题描述

我使用gtkmm制作GUI程序。
我想为Gtk :: DrawingArea小部件绘制一些图形，但是我想要该小部件是可调整大小的，所以当我画一个线从（0,0）到 50，50）像素 - 绘图区域应调整为大小为（50,50）的正方形;当我例如从（0,0）绘制一条线，让我们说（100,70）像素时 - 绘制区域应当被调整为大小为（100,70）的矩形。

I am making a GUI program using "gtkmm". I would like to draw some graphics to the "Gtk::DrawingArea" widget but I want that widget to be "resizable", so when I draw let's say a line from "(0, 0)" to "(50, 50)" pixel - the drawing area should be resized to a square of size "(50, 50)"; and when I for example draw a line from "(0, 0)" to let's say "(100, 70)" pixel - the drawing area should be resized to a rectangle of size "(100, 70)".

为此，我将Gtk :: DrawingArea小部件放入Gtk :: ScrolledWindow容器中。

And to do this - I put the "Gtk::DrawingArea" widget into the "Gtk::ScrolledWindow" container.

所以当我把一个大小为（100，100）的图片绘制区域 - >我会调用适当的成员函数Gtk :: DrawingArea :: set ___ size_request（100，100），将设置大小的绘图区域到（100,100）像素。因此，如果Gtk :: ScrolledWindow比Gtk :: DrawingArea更小，滚动窗口应该更改为可滚动 - 但问题是，它不工作!!!!!

So when I put a picture with size "(100, 100)" to the drawing area -> I will call the appropriate member function "Gtk::DrawingArea::set___size_request(100, 100)", which will set the size of the drawing area to (100, 100) pixels. So if the "Gtk::ScrolledWindow" is "smaller" than the "Gtk::DrawingArea" inside it, the scrolled window should change to "scrollable" - BUT THE PROBLEM IS, THAT IT DOES NOT WORK!!!!!

因此，任何人都可以解释我该如何做？

So could anybody explain me how can I do this?

谢谢。

推荐答案

在您的ScrolledWindow和DrawingArea之间添加GTK :: Viewport。

Add a GTK::Viewport in between your ScrolledWindow and DrawingArea.

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