MouseEventArgs and Mouse Wheel

MouseEventArgs

1. Draw with Mouse

An article showing how to draw on screen

2. Detecting Mouse Wheel Movement

The mouse wheel can often provide a handy alternative to slower mouse operations, such as scrolling areas without positioning the cursor within a scroll bar. Many Windows Forms controls have built-in wheel support but custom wheel actions are possible.

3. MouseEventArgs.Delta Property

Gets a signed count of the number of detents the mouse wheel has rotated, multiplied by the WHEEL_DELTA constant. A detent is one notch of the mouse wheel.

4. MouseEventArgs Class

Provides data for the MouseUp, MouseDown, and MouseMove events.

5. MouseEventHandler Delegate

Represents the method that will handle the MouseDown, MouseUp, or MouseMove event of a form, control, or other component.

6. Control.MouseWheel Event

Occurs when the mouse wheel moves while the control has focus.

When handling the MouseWheel event it is important to follow the user interface (UI) standards associated with the mouse wheel. The MouseEventArgs.Delta property value indicates the amount the mouse wheel has been moved. The UI should scroll when the accumulated delta is plus or minus 120. The UI should scroll the number of logical lines returned by the SystemInformation.MouseWheelScrollLines property for every delta value reached. You can also scroll more smoothly in smaller that 120 unit increments, however the ratio should remain constant, that is SystemInformation.MouseWheelScrollLines lines scrolled per 120 delta units of wheel movement.

7. Demonstration of e.Delta Property of MouseWheel

This is a simple demonstration of e.Delta property of MouseWheel event , On scroll Up and Down of Mouse wheel. (MouseEventHandler).

8. How to code these rules for mousewheel up/down to control timed value decrease/increase?

have a value int -can be retrieved as intopacitylevel- that controls opacity of an element on a Form. When I run my application, the value is set to a number of the random range 1 - 255. How could I put the following together as a mousewheel solution in c#?: What I want is, moving the mwheel up or down will constantly change the opacity value to the minimum or maximum value depending on mwheel movement direction by adding/subtracting 1 to the current value every 1ms. This behaviour precisely:

For up direction, stop value increase only when the mwheel was moved to the next spot upwards or when the value is at the maximum 255. For down direction, stop value decrease only when the mwheel was moved to the next spot downwards or when the value is at the minimum 1. This .gif shows the result I want: at this place was a picture in the past

9. #677 – Why the Standard Mouse Wheel Delta is 120

For a standard Microsoft mouse, you’ll notice that the value of the MouseWheelEventArgs.Delta parameter is always either 120 when you turn the mouse wheel forward one click or -120 when you turn the mouse wheel backwards one click. You might wonder why the value of 120 is used, rather than just 1 and -1 values.

10. UIElement.PreviewMouseWheel Event

Occurs when the user rotates the mouse wheel while the mouse pointer is over this element.

11. Mousewheel Delta value always 120

The problem is that the Delta value is always 120, as explained in MSDN. So, even if I turn the wheel 1 notch or 5 notches it will always be 120. Do you know a way around this?

12. C# Mouse Events

Bear in mind that the mouse is hardware and not software. Windows will detect what happens with the mouse and generate events as appropriate. It sends an object of type MouseEventArgs (or in some cases EventArgs, the base class) to each handler as its second argument.

13. Zooming and panning in Windows Forms with fixed focus

How to do zooming and panning in Windows Forms with fixed focus.

14. Improve Zooming with Enhanced Mouse Wheels

How to give your users a better zooming experience with High Resolution Mouse Wheels.