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Scroll text in a MaterialMultiLineTextBox2 #330

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merged 2 commits into from
Feb 6, 2022
Merged

Scroll text in a MaterialMultiLineTextBox2 #330

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5cb3963
Added support to scroll text in a MaterialMultiLineTextBox2 even with…
Feb 3, 2022
d4dcf96
Update AllowScroll Category
orapps44 Feb 6, 2022
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97 changes: 70 additions & 27 deletions MaterialSkin/Controls/MaterialMultiLineTextBox2.cs
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Original file line number Diff line number Diff line change
@@ -1,12 +1,12 @@

namespace MaterialSkin.Controls
{
using System;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using MaterialSkin.Animations;
using System;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using MaterialSkin.Animations;

public class MaterialMultiLineTextBox2 : Control, IMaterialControl
{
Expand All @@ -15,7 +15,7 @@ public class MaterialMultiLineTextBox2 : Control, IMaterialControl
ContextMenuStrip _lastContextMenuStrip = new ContextMenuStrip();

//Properties for managing the material design properties

[Browsable(false)]
public int Depth { get; set; }

Expand All @@ -24,9 +24,9 @@ public class MaterialMultiLineTextBox2 : Control, IMaterialControl

[Browsable(false)]
public MouseState MouseState { get; set; }
//Unused properties

//Unused properties

[Browsable(false)]
public override System.Drawing.Image BackgroundImage { get; set; }

Expand All @@ -47,14 +47,14 @@ public class MaterialMultiLineTextBox2 : Control, IMaterialControl
public override System.Drawing.Color ForeColor { get; set; }

//Material Skin properties


[Category("Material Skin"), DefaultValue(""), Localizable(true)]
public string Hint
{
get { return baseTextBox.Hint; }
set
{
public string Hint
{
get { return baseTextBox.Hint; }
set
{
baseTextBox.Hint = value;
hasHint = !String.IsNullOrEmpty(baseTextBox.Hint);
Invalidate();
Expand All @@ -65,6 +65,13 @@ public string Hint
public bool UseAccent { get; set; }



[Browsable(true)]
[Category("Material Skin"), DefaultValue(true), Description("Defines whether MaterialMultiLineTextBox allows scrolling of text. This property is independent of the ScrollBars property")]
public bool AllowScroll { get; set; }



//TextBox properties

public override ContextMenuStrip ContextMenuStrip
Expand Down Expand Up @@ -110,12 +117,12 @@ public override ContextMenuStrip ContextMenuStrip
public char PasswordChar { get { return baseTextBox.PasswordChar; } set { baseTextBox.PasswordChar = value; } }

[Category("Behavior")]
public bool ShortcutsEnabled
{
get
{ return baseTextBox.ShortcutsEnabled; }
set
{
public bool ShortcutsEnabled
{
get
{ return baseTextBox.ShortcutsEnabled; }
set
{
baseTextBox.ShortcutsEnabled = value;
if (value == false)
{
Expand Down Expand Up @@ -199,8 +206,8 @@ public bool LeaveOnEnterKey
public void Paste() { baseTextBox.Paste(); }


# region Forwarding events to baseTextBox
#region Forwarding events to baseTextBox

public event EventHandler AcceptsTabChanged
{
add
Expand Down Expand Up @@ -321,7 +328,7 @@ public event EventHandler BorderStyleChanged
}
}

#if NETFRAMEWORK
#if NETFRAMEWORK
public new event EventHandler ContextMenuChanged
{
add
Expand All @@ -333,7 +340,7 @@ public event EventHandler BorderStyleChanged
baseTextBox.ContextMenuChanged -= value;
}
}
#endif
#endif

public new event EventHandler ContextMenuStripChanged
{
Expand Down Expand Up @@ -1043,7 +1050,7 @@ public event EventHandler ReadOnlyChanged
}
}

public event EventHandler TextAlignChanged
public event EventHandler TextAlignChanged
{
add
{
Expand Down Expand Up @@ -1117,10 +1124,15 @@ public event EventHandler TextAlignChanged
private const int RIGHT_PADDING = 12;
private int LINE_Y;
private bool hasHint;
private readonly int SB_LINEUP = 0;
private readonly int SB_LINEDOWN = 1;
private readonly uint WM_VSCROLL = 277;
private readonly IntPtr ptrLparam = new IntPtr(0);

protected readonly BaseTextBox baseTextBox;
public MaterialMultiLineTextBox2()
{
AllowScroll = true;
// Material Properties
UseAccent = true;
MouseState = MouseState.OUT;
Expand Down Expand Up @@ -1180,6 +1192,7 @@ public MaterialMultiLineTextBox2()
cms.Opening += ContextMenuStripOnOpening;
cms.OnItemClickStart += ContextMenuStripOnItemClickStart;
ContextMenuStrip = cms;
this.MouseWheel += OnMouseWheel;
}

private void Redraw(object sencer, EventArgs e)
Expand Down Expand Up @@ -1236,6 +1249,36 @@ protected override void OnPaint(PaintEventArgs pevent)
}
}


[DllImport("User32.dll", CharSet = CharSet.Auto, EntryPoint = "SendMessage")]
protected static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

protected void OnMouseWheel(object sender, MouseEventArgs e)
{
if (AllowScroll)
{
if (DesignMode)
return;
//Calculate number of notches mouse wheel moved
int v = e.Delta / 120;
//Down Movement
if (v < 0)
{
var ptrWparam = new IntPtr(SB_LINEDOWN);
SendMessage(baseTextBox.Handle, WM_VSCROLL, ptrWparam, ptrLparam);
}
//Up Movement
else if (v > 0)
{
var ptrWparam = new IntPtr(SB_LINEUP);
SendMessage(baseTextBox.Handle, WM_VSCROLL, ptrWparam, ptrLparam);
}

baseTextBox?.Focus();
base.OnMouseDown(e);
}
}

protected override void OnMouseMove(MouseEventArgs e)
{
if (DesignMode)
Expand Down