回答編集履歴
1
GetMaximum を調整
test
CHANGED
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@@ -1,56 +1,64 @@
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1
1
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VScrollBar と FlowLayoutPanel のスクロールが同期できているなら、FlowLayoutPanel の MouseWheel イベントでは、VScrollBar の Value プロパティを操作します。
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2
2
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MouseEventArgs.Delta の値の大小は無視し、プラスかマイナスかで判定してください。
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```
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4
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```cs
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5
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using System.Runtime.InteropServices;
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using System.Runtime.InteropServices;
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public partial class Form1 : Form
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public partial class Form1 : Form
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{
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{
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public Form1() {
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public Form1() {
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InitializeComponent();
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InitializeComponent();
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Shown += Form1_Shown;
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Shown += Form1_Shown;
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vScrollBar1.ValueChanged += VScrollBar1_ValueChanged;
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vScrollBar1.ValueChanged += VScrollBar1_ValueChanged;
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flowLayoutPanel1.MouseWheel += FlowLayoutPanel1_MouseWheel;
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flowLayoutPanel1.MouseWheel += FlowLayoutPanel1_MouseWheel;
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}
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private void Form1_Shown(object? sender, EventArgs e) {
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vScrollBar1.Minimum = 0;
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vScrollBar1.Maximum = GetMaximum(flowLayoutPanel1, 10);
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vScrollBar1.Value = 0;
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flowLayoutPanel1.VerticalScroll.Minimum = vScrollBar1.Minimum;
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flowLayoutPanel1.VerticalScroll.Maximum = vScrollBar1.Maximum;
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flowLayoutPanel1.VerticalScroll.Value = vScrollBar1.Value;
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}
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private static int GetMaximum(Control control, int margin) {
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int maxBottom = 0;
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foreach (Control child in control.Controls) {
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if (child.Bottom > maxBottom) {
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maxBottom = child.Bottom;
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}
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}
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int pageHeight = control.ClientSize.Height;
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if (maxBottom <= pageHeight) {
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return 0;
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}
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return maxBottom - pageHeight + margin;
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}
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[DllImport("user32.dll")]
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static extern bool LockWindowUpdate(IntPtr hWndLock);
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private void VScrollBar1_ValueChanged(object? sender, EventArgs e) {
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LockWindowUpdate(flowLayoutPanel1.Handle);
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flowLayoutPanel1.Visible = false;
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flowLayoutPanel1.VerticalScroll.Value = vScrollBar1.Value;
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flowLayoutPanel1.Visible = true;
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LockWindowUpdate(IntPtr.Zero);
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}
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private void FlowLayoutPanel1_MouseWheel(object? sender, MouseEventArgs e) {
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SetScroll(e.Delta > 0 ? -1 : 1);
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}
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private void SetScroll(int changeValue) {
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var tmpValue = vScrollBar1.Value + changeValue;
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vScrollBar1.Value = Math.Min(
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Math.Max(tmpValue, vScrollBar1.Minimum),
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vScrollBar1.Maximum);
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}
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}
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private void Form1_Shown(object? sender, EventArgs e) {
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vScrollBar1.Minimum = 0;
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vScrollBar1.Maximum = GetMaximum(flowLayoutPanel1, vScrollBar1.LargeChange);
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vScrollBar1.Value = 0;
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flowLayoutPanel1.VerticalScroll.Minimum = vScrollBar1.Minimum;
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flowLayoutPanel1.VerticalScroll.Maximum = vScrollBar1.Maximum;
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flowLayoutPanel1.VerticalScroll.Value = vScrollBar1.Value;
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}
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private int GetMaximum(Control control, int largeChange) {
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int maxBottom = 0;
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foreach (Control child in control.Controls) {
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if (child.Bottom > maxBottom) {
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maxBottom = child.Bottom;
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}
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}
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int pageHeight = control.ClientSize.Height;
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return (maxBottom + pageHeight - 1) * largeChange / pageHeight;
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}
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[DllImport("user32.dll")]
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static extern bool LockWindowUpdate(IntPtr hWndLock);
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private void VScrollBar1_ValueChanged(object? sender, EventArgs e) {
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LockWindowUpdate(flowLayoutPanel1.Handle);
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flowLayoutPanel1.Visible = false;
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flowLayoutPanel1.VerticalScroll.Value = vScrollBar1.Value;
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flowLayoutPanel1.Visible = true;
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LockWindowUpdate(IntPtr.Zero);
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}
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private void FlowLayoutPanel1_MouseWheel(object? sender, MouseEventArgs e) {
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var tmpValue = vScrollBar1.Value + (e.Delta > 0 ? -1 : 1);
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vScrollBar1.Value = Math.Min(
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Math.Max(tmpValue, vScrollBar1.Minimum),
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vScrollBar1.Maximum);
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}
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}
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62
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```
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55
63
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56
64
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VScrollBar を操作すると、FlowLayoutPanel のスクロールバーが一瞬表示されることがあるので、LockWindowUpdate で描画を抑止しています。
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