ScrollBarBase.Maximum Property
Gets or sets the upper limit of values of the scrollable range.
Namespace: DevExpress.XtraEditors
Assembly: DevExpress.Utils.v24.1.dll
NuGet Packages: DevExpress.Utils, DevExpress.Wpf.Core
Declaration
Property Value
Type | Default | Description |
---|---|---|
Int32 | 100 | An integer value representing the value’s upper limit. |
Remarks
The scroll bar’s value represented by the ScrollBarBase.Value property corresponds to the scroll box’s position in the scroll bar. Use the Maximum property to determine the upper limit value that can be reached.
Note: the scroll bar’s value cannot reach its maximum value through user interaction at run time. The maximum value that can be reached is equal to the Maximum property value minus the ScrollBarBase.LargeChange property value plus one. The maximum value can only be reached programmatically.
Example
The following sample code uses both HScrollBar and VScrollBar controls to provide easy navigation through an image displayed within the pictureBox control if image dimensions extend the dimensions of the picture box. The Paint picture box event is handled to draw a specific image region specified by the position of the scroll bar to the screen. The x and y variables correspondingly represent the x- and y-coordinate of the upper-left corner of the portion of the image to draw in the picture box. The ScrollBarBase.Scroll events are used, in turn, to define the coordinates of the upper-left corner of the image portion according to scroll bar position after the user has scrolled either one or both scroll bars.
using DevExpress.XtraEditors;
private void Form1_Load(object sender, System.EventArgs e) {
hScrollBar1.Width = pictureBox1.Width;
hScrollBar1.Left = pictureBox1.Left;
hScrollBar1.Top = pictureBox1.Bottom;
hScrollBar1.Maximum = pictureBox1.Image.Width - pictureBox1.Width;
vScrollBar1.Height = pictureBox1.Height;
vScrollBar1.Left = pictureBox1.Left + pictureBox1.Width;
vScrollBar1.Top = pictureBox1.Top;
vScrollBar1.Maximum = pictureBox1.Image.Height - pictureBox1.Height;
}
int x = 0;
private void hScrollBar1_Scroll(object sender, System.Windows.Forms.ScrollEventArgs e) {
x = (sender as HScrollBar).Value;
pictureBox1.Refresh();
}
int y = 0;
private void vScrollBar1_Scroll(object sender, System.Windows.Forms.ScrollEventArgs e) {
y = (sender as VScrollBar).Value;
pictureBox1.Refresh();
}
private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) {
pBox = sender as PictureBox;
e.Graphics.DrawImage(pBox.Image, e.ClipRectangle, x, y, e.ClipRectangle.Width,
e.ClipRectangle.Height, GraphicsUnit.Pixel);
}