将自定义水平滚动条的滚动同步到数据网格视图的滚动

Question

我有一个数据网格视图和两个自定义滚动条 - 一个垂直滚动条和一个水平滚动条。

我正在填充 datagridview 时调整滚动条的大小

scrollBarEx1.Maximum = dataGridView1.RowCount;
scrollBarEx3.Maximum = dataGridView1.ColumnCount;

这是 datagridview1 的滚动事件

private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
        {
            if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                scrollBarEx1.Value = e.NewValue;
            }
            else if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
            {
                scrollBarEx3.Value = e.NewValue;
            }
        }

下面是两个滚动条滚动事件的代码

private void scrollBarEx1_Scroll(object sender, ScrollEventArgs e)
        {
            dataGridView1.Rows[dataGridView1.FirstDisplayedScrollingRowIndex].Height = e.NewValue;
}

private void scrollBarEx3_Scroll(object sender, ScrollEventArgs e)
        {
            dataGridView1.Columns[dataGridView1.FirstDisplayedScrollingColumnIndex].Width = e.NewValue;
        }

但是只有垂直滚动有效。水平滚动会滚动，但网格不会随之滚动。请帮忙

Answer 1

当你有一个自定义卷轴时，你总是设置 maximum，largechange 和 small change 的值如下：

Horizontal Scroll

Maximum = total width
LargeChange = control width
SmallChange = 10% of total width, in this case the width of first column

Vertical Scroll

Maximum = total height
LargeChange = control height
SmallChange = 10% of total height, in this case the height of first row

因此对于水平：

//set these values probably at form load event
int totalwidth = dataGridView1.RowHeadersWidth + 1;
         
for( int i = 0; i < dataGridView1.Columns.Count; i++ ) {
    totalwidth += dataGridView1.Columns[ i ].Width;
}

hScrollBar1.Maximum = totalwidth;
hScrollBar1.LargeChange = dataGridView1.Width;
hScrollBar1.SmallChange= dataGridView1.Columns[ 0 ].Width;

和

private void dataGridView1_Scroll( object sender, ScrollEventArgs e ) {
    if( e.ScrollOrientation == ScrollOrientation.HorizontalScroll ) {
        hScrollBar1.Value = e.NewValue;
    }
}

private void hScrollBar1_Scroll( object sender, ScrollEventArgs e ) {
    dataGridView1.HorizontalScrollingOffset = e.NewValue;
}

编辑

对于 DataGridView 中的垂直滚动，您不能按像素滚动，只能按行滚动。所以

Vertical Scroll

Maximum = total number of rows
LargeChange = number of visible rows, even a small part counts
SmallChange = 1

因此对于垂直

vScrollBar1.Maximum = dataGridView1.RowCount;
vScrollBar1.LargeChange = dataGridView1.DisplayedRowCount(true);
vScrollBar1.SmallChange = 1;

和

private void dataGridView1_Scroll( object sender, ScrollEventArgs e ) {
    if( e.ScrollOrientation == ScrollOrientation.VerticalScroll ) {
        vScrollBar1.Value = e.NewValue;
    }
}

private void vScrollBar1_Scroll( object sender, ScrollEventArgs e ) {  
    dataGridView1.FirstDisplayedScrollingRowIndex = e.NewValue;
}

将自定义水平滚动条的滚动同步到数据网格视图的滚动

syncing custom horizontal scrollbar's scroll to datagridview's scroll

c#

winforms

custom-controls