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How do I scroll vertically?
Move your mouse pointer away from the scroll-bar and then move the mouse wheel. Or else see if you can disable the horizontal scroll-bar. Press the middle mouse button once and then move your pointer to scroll the page vertically.
How do you scroll using keys?
Use the arrow up and arrow down keys. In the lower right side of your keyboard (usually between the letter keys and number keypad) is a set of four arrow keys. Pressing the up and down keys should allow you to scroll up and down the page you are viewing.
How do I scroll down with mouse?
Dragging the scroll bar thumb Click on and hold the scroll bar thumb and then move your mouse forward or back over the mouse mat to move up or down on the screen. In programs like spreadsheets, where there is a lot of content that’s too wide to fit on the screen, you will often find a horizontal scroll bar.
What happens when you press the scroll wheel?
The scroll wheel can also be used as a third button on the mouse. For example instead of pressing the left button to click on a link in a webpage you can press the scroll wheel just once and the link will appear in a new tab on the web browser. You can also close a tab by clicking on it with the scroll wheel.
How does the scroll bar work in Win32?
Similarly, if the control decides it needs a scrollbar, Windows reserves more space in the non-client area on right and/or bottom side of the control for the scrollbars. This behavior for the border and scrollbars is implemented in the function DefWindowProc () which handles many messages:
How to support scrolling within your control controls?
How to support scrolling within your controls. Many controls are designed to present some dynamic contents, or larger amount of data which cannot fit into the control or a dialog. In such cases, the controls often need to be equipped with scrollbars so that user can navigate within the data.
Why do I need to update my scrollbar size?
Remember that when setting up e.g. a vertical scrollbar, and the values change so that the scrollbar gets visible or gets hidden, the size of its client area changes. This change in client area size can result also in the need to update state of the other scrollbar. Consider the following code demonstrating the issue:
Why is WM _ ncpaint called in DefWindowProc?
WM_NCPAINT is called to paint the non-client area. Again, handler of the message in DefWindowProc () knows how to paint the border and the scrollbars. All of this standard behavior can be overridden if you handle these messages in your window procedure, but that’s not the what I want to talk about today.