TIEMouseWheelParams.Variation
Declaration
property Variation: TIEMouseWheelParamsVariation;
Description
Specifies how much scrolling or zooming occurs in response to mouse wheel rotation
| Value | Description |
| iemwAbsolute | Value contains the absolute value to add or subtract from the current value |
| iemwPercentage | Value contains the percentage of variation from the current value |
Default: iemwPercentage
Note:
◼In the case of
TImageEnMView, the height is actually based on a theoretical grid of 12.5 thumbnails high. So if
iemwPercentage is used 8% equates to scrolling one thumbnail per wheel click, whereas 4% would scroll 1/2 a thumbnail
◼Has no effect if
Action is
iemwNavigate
// For iemwVScroll used with iemwPercentage, TImageEnMView assumes a theoretical grid of 12.5 thumbnails high
// So the default of 8% will scroll one thumbnail with each wheel click
// Whereas 16% would scroll the height of two thumbnails
ImageEnMView1.MouseWheelParams.Action := iemwVScroll;
ImageEnMView1.MouseWheelParams.Variation := iemwPercentage;
ImageEnMView1.MouseWheelParams.value := 4; // half a thumbnail
// Mouse wheel will scroll image of TImageEnView by 15% of component height
ImageEnView1.MouseWheelParams.Action := iemwVScroll;
ImageEnView1.MouseWheelParams.Variation := iemwPercentage;
ImageEnView1.MouseWheelParams.value := 15;
// Mouse wheel will scroll image of TImageEnView by 1 pixel
ImageEnView1.MouseWheelParams.Action := iemwVScroll;
ImageEnView1.MouseWheelParams.Variation := iemwAbsolute;
ImageEnView1.MouseWheelParams.value := 1;