回答編集履歴
2
トグルじゃまずいやｗ
test
CHANGED
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@@ -101,7 +101,8 @@
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101
101
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set
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102
102
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{
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103
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var style = GetWindowLong(Handle, GWL_EXSTYLE);
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104
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+
if (value) style |= WS_EX_LEFTSCROLLBAR;
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104
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-
style
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105
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else style &= ~WS_EX_LEFTSCROLLBAR;
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105
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SetWindowLong(Handle, GWL_EXSTYLE, style);
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Refresh();
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108
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}
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1
追記 トグル動作
test
CHANGED
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@@ -47,3 +47,71 @@
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47
47
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---
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48
48
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49
49
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不特定多数が使うなら、あまりイレギュラーなことをするべきではありません（個人で使う分には好きにすればいいとは思いますが）
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50
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+
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51
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---
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52
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+
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53
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追記
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54
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> 既存のリッチテキストボックスのスクロールバーを左にしたり、右にしたりと変更可能にしたい
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55
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+
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56
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こんなんでしょうか（細かく確認していないので、なにか不具合等あるかもしれませんが）
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57
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```cs
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58
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+
using System;
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59
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using System.Runtime.InteropServices;
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60
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using System.Windows.Forms;
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61
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+
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62
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63
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namespace Qklheq94bhpzvyp
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64
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{
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65
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public partial class Form1 : Form
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66
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{
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67
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private LeftScrollBarRichTextBox leftScrollBarRichTextBox;
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68
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+
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69
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public Form1()
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70
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{
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71
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InitializeComponent();
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72
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+
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73
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leftScrollBarRichTextBox = new LeftScrollBarRichTextBox
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74
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{
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75
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Dock = DockStyle.Fill,
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76
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Parent = this,
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77
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Text = $"aaa{new string('\n', 26)}あああ",
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78
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};
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79
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+
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80
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new CheckBox
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81
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{
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82
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Dock = DockStyle.Top,
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83
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Parent = this,
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84
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Text = "LeftScrollBar",
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85
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}.CheckedChanged += CheckedChanged;
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86
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}
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87
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+
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88
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private void CheckedChanged(object sender, EventArgs e)
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89
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{
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90
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if (sender is CheckBox checkBox)
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91
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leftScrollBarRichTextBox.LeftScrollBar = checkBox.Checked;
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92
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}
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93
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}
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94
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95
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// [c# - TextBox with vertical scrollbar on the left side - Stack Overflow](https://stackoverflow.com/questions/14402428/textbox-with-vertical-scrollbar-on-the-left-side)
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96
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public class LeftScrollBarRichTextBox : RichTextBox
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97
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{
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98
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public bool LeftScrollBar
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99
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{
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100
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get => (GetWindowLong(Handle, GWL_EXSTYLE) & WS_EX_LEFTSCROLLBAR) != 0;
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101
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set
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102
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{
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103
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var style = GetWindowLong(Handle, GWL_EXSTYLE);
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104
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style ^= WS_EX_LEFTSCROLLBAR;
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105
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SetWindowLong(Handle, GWL_EXSTYLE, style);
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106
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Refresh();
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107
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}
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108
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}
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109
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+
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110
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private const int GWL_EXSTYLE = -20;
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111
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private const int WS_EX_LEFTSCROLLBAR = 16384;
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112
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[DllImport("user32")] private extern static int GetWindowLong(IntPtr hWnd, int nIndex);
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113
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[DllImport("user32")] private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
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114
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}
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115
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}
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116
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```
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117
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+
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