回答編集履歴
4
コード改善
test
CHANGED
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@@ -50,6 +50,10 @@
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{
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// initialize
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public Form1()
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{
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@@ -60,31 +64,31 @@
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h => (sender, e) => h(e), h => numericUpDown1.ValueChanged += h, h => numericUpDown1.ValueChanged -= h)
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.Throttle(TimeSpan.FromMilliseconds(500)) // 動作がわかりやすいようにわざと大きめの値を入れている
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.Throttle(TimeSpan.FromMilliseconds(500)) // 動作がわかりやすいように、わざと大きめの値を入れている
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.ObserveOn(System.Threading.SynchronizationContext.Current) // UIスレッドで監視
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.Subscribe(_ => numericUpDown1_Changed());
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}
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-
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private void numericUpDown1_Changed()
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private void numericUpDown1_Changed() // イベントから外しておく
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{
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int length = Convert.ToInt32(numericUpDown1.Value);
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pictureBox1.Image = MakeBmp(length);
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label1.Text = length.ToString(); // 確認用に追加
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}
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private Bitmap MakeBmp(int length)
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3
ミス修正
test
CHANGED
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@@ -54,6 +54,8 @@
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{
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InitializeComponent();
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Observable.FromEvent<EventHandler, EventArgs>(
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h => (sender, e) => h(e), h => numericUpDown1.ValueChanged += h, h => numericUpDown1.ValueChanged -= h)
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@@ -66,7 +68,7 @@
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}
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2
Rx追記
test
CHANGED
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@@ -19,3 +19,93 @@
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面倒なのでRxのThrottle使ったほうが簡潔ですが。
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---
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(NuGetからSystem.Reactiveを追加して)
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```C#
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using System;
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using System.Drawing;
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using System.Windows.Forms;
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using System.Reactive.Linq;
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namespace WindowsFormsApplication1
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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Observable.FromEvent<EventHandler, EventArgs>(
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h => (sender, e) => h(e), h => numericUpDown1.ValueChanged += h, h => numericUpDown1.ValueChanged -= h)
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.Throttle(TimeSpan.FromMilliseconds(500)) // 動作がわかりやすいようにわざと大きめの値を入れている
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.Subscribe(_ => numericUpDown1_Changed());
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InitializeComponent();
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}
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private void numericUpDown1_Changed() // これはnumericupDown1のイベントから外しておく
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{
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int length = Convert.ToInt32(numericUpDown1.Value);
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pictureBox1.Image = MakeBmp(length);
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}
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private Bitmap MakeBmp(int length)
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{
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Bitmap bmp = new Bitmap(pictureBox1.Size.Width, pictureBox1.Size.Height);
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using (Graphics g_bmp = Graphics.FromImage(bmp))
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{
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g_bmp.FillRectangle(Brushes.Red, new Rectangle(0, 0, length, length));
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}
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return bmp;
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}
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}
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}
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```
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1
追記
test
CHANGED
|
@@ -11,3 +11,11 @@
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11
11
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12
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13
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時刻はDateTime.Nowでとれます。
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Timerで監視すればいいでしょう。
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面倒なのでRxのThrottle使ったほうが簡潔ですが。
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