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// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2005-2006 Novell, Inc. (http://www.novell.com)
//
// Authors:
// Peter Dennis Bartok (pbartok@novell.com)
//
//
// COMPLETE
#undef Debug
using System;
using System.ComponentModel;
using System.Drawing;
using System.Reflection;
using System.Runtime.InteropServices;
namespace System.Windows.Forms {
[DefaultEvent("SplitterMoved")]
[Designer("System.Windows.Forms.Design.SplitterDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
[DefaultProperty("Dock")]
public class Splitter : Control, IMessageFilter {
#region Enums
private enum DrawType {
Initial,
Redraw,
Finish
}
#endregion // Enums
#region Local Variables
static private Cursor splitter_ns;
static private Cursor splitter_we;
private BorderStyle border_style;
private int min_extra;
private int min_size;
private int split_position; // Current splitter position
private int prev_split_position; // Previous splitter position, only valid during drag
private int click_offset; // Click offset from border of splitter control
private int splitter_size; // Size (width or height) of our splitter control
private bool horizontal; // true if we've got a horizontal splitter
private Control affected; // The control that the splitter resizes
private Control filler; // The control that MinExtra prevents from being shrunk to 0 size
private SplitterEventArgs sevent; // We cache the object, prevents fragmentation
private int limit_min; // The max we're allowed to move the splitter left/up
private int limit_max; // The max we're allowed to move the splitter right/down
#endregion // Local Variables
#region Constructors
static Splitter() {
try {
splitter_ns = new Cursor(typeof(Splitter), "SplitterNS.cur");
}
catch (System.IO.FileNotFoundException) {
splitter_ns = Cursors.SizeNS;
}
try {
splitter_we = new Cursor(typeof(Splitter), "SplitterWE.cur");
}
catch (System.IO.FileNotFoundException) {
splitter_we = Cursors.SizeWE;
}
}
public Splitter() {
min_extra = 25;
min_size = 25;
split_position = -1;
splitter_size = 3;
horizontal = false;
sevent = new SplitterEventArgs(0, 0, 0, 0);
SetStyle(ControlStyles.Selectable, false);
Anchor = AnchorStyles.None;
Dock = DockStyle.Left;
Paint += new PaintEventHandler(PaintSplitter);
Layout += new LayoutEventHandler(LayoutSplitter);
Cursor = splitter_we;
}
#endregion // Constructors
#region Public Instance Properties
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override bool AllowDrop {
get {
return base.AllowDrop;
}
set {
base.AllowDrop = value;
}
}
[Browsable(false)]
[DefaultValue(AnchorStyles.None)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override AnchorStyles Anchor {
get {
return AnchorStyles.None;
}
set {
; // MS doesn't set it
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override Image BackgroundImage {
get {
return base.BackgroundImage;
}
set {
base.BackgroundImage = value;
}
}
[DispId(-504)]
[DefaultValue (BorderStyle.None)]
[MWFDescription("Sets the border style for the splitter")]
[MWFCategory("Appearance")]
public BorderStyle BorderStyle {
get {
return border_style;
}
set {
border_style = value;
switch(value) {
case BorderStyle.FixedSingle: {
splitter_size = 4; // We don't get motion events for 1px wide windows on X11. sigh.
break;
}
case BorderStyle.Fixed3D: {
value = BorderStyle.None;
splitter_size = 3;
break;
}
case BorderStyle.None: {
splitter_size = 3;
break;
}
default: {
throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for BorderStyle", value));
}
}
base.InternalBorderStyle = value;
}
}
[DefaultValue(DockStyle.Left)]
[Localizable(true)]
public override DockStyle Dock {
get {
return base.Dock;
}
set {
if (!Enum.IsDefined (typeof (DockStyle), value) || (value == DockStyle.None) || (value == DockStyle.Fill)) {
throw new ArgumentException("Splitter must be docked left, top, bottom or right");
}
if ((value == DockStyle.Top) || (value == DockStyle.Bottom)) {
horizontal = true;
Cursor = splitter_ns;
} else {
horizontal = false;
Cursor = splitter_we;
}
base.Dock = value;
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override Font Font {
get {
return base.Font;
}
set {
base.Font = value;
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override Color ForeColor {
get {
return base.ForeColor;
}
set {
base.ForeColor = value;
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new ImeMode ImeMode {
get {
return base.ImeMode;
}
set {
base.ImeMode = value;
}
}
[DefaultValue(25)]
[Localizable(true)]
[MWFDescription("Sets minimum size of undocked window")]
[MWFCategory("Behaviour")]
public int MinExtra {
get {
return min_extra;
}
set {
min_extra = value;
}
}
[DefaultValue(25)]
[Localizable(true)]
[MWFDescription("Sets minimum size of the resized control")]
[MWFCategory("Behaviour")]
public int MinSize {
get {
return min_size;
}
set {
min_size = value;
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[MWFDescription("Current splitter position")]
[MWFCategory("Layout")]
public int SplitPosition {
get {
if (affected == null) {
return -1;
}
if (Capture) {
return CalculateSplitPosition();
}
if (horizontal) {
return affected.Height;
} else {
return affected.Width;
}
}
set {
if (Capture || (affected == null)) {
return;
}
if (horizontal) {
affected.Height = value;
} else {
affected.Width = value;
}
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public bool TabStop {
get {
return base.TabStop;
}
set {
base.TabStop = value;
}
}
[Bindable(false)]
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override string Text {
get {
return base.Text;
}
set {
base.Text = value;
}
}
#endregion // Public Instance Properties
#region Protected Instance Properties
protected override CreateParams CreateParams {
get {
return base.CreateParams;
}
}
protected override ImeMode DefaultImeMode {
get {
return ImeMode.Disable;
}
}
protected override Size DefaultSize {
get {
return new Size (3, 3);
}
}
#endregion // Protected Instance Properties
#region Public Instance Methods
public bool PreFilterMessage(ref Message m) {
return false;
}
public override string ToString() {
return base.ToString () + String.Format(", MinExtra: {0}, MinSize: {1}", min_extra, min_size);
}
#endregion // Public Instance Methods
#region Protected Instance Methods
protected override void OnKeyDown(KeyEventArgs e) {
base.OnKeyDown (e);
if (Capture && (e.KeyCode == Keys.Escape)) {
Capture = false;
DrawDragHandle(DrawType.Finish);
}
}
protected override void OnMouseDown(MouseEventArgs e) {
Point pt;
base.OnMouseDown (e);
// Only allow if we are set up properly
if (affected == null || e.Button != MouseButtons.Left) {
return;
}
// Prepare the job
Capture = true;
// Calculate limits
if (filler != null) {
if (horizontal) {
if (dock_style == DockStyle.Top) {
limit_min = affected.Bounds.Top + min_size;
limit_max = filler.Bounds.Bottom - min_extra + this.bounds.Top - filler.Bounds.Top;
} else {
limit_min = filler.Bounds.Top + min_extra + this.bounds.Top - filler.Bounds.Bottom;
limit_max = affected.Bounds.Bottom - min_size - this.Height;
}
} else {
if (dock_style == DockStyle.Left) {
limit_min = affected.Bounds.Left + min_size;
limit_max = filler.Bounds.Right - min_extra + this.bounds.Left - filler.Bounds.Left;
} else {
limit_min = filler.Bounds.Left + min_extra + this.bounds.Left - filler.Bounds.Right;
limit_max = affected.Bounds.Right - min_size - this.Width;
}
}
} else {
limit_min = 0;
if (horizontal) {
limit_max = affected.Parent.Height;
} else {
limit_max = affected.Parent.Width;
}
}
#if Debug
Console.WriteLine("Sizing limits: Min:{0}, Max:{1}", limit_min, limit_max);
#endif
pt = PointToScreen(parent.PointToClient(new Point(e.X, e.Y)));
if (horizontal) {
split_position = pt.Y;
if (dock_style == DockStyle.Top) {
click_offset = e.Y;
} else {
click_offset = -e.Y;
}
} else {
split_position = pt.X;
if (dock_style == DockStyle.Left) {
click_offset = e.X;
} else {
click_offset = -e.X;
}
}
// We need to set this, in case we never get a mouse move
prev_split_position = split_position;
#if Debug
Console.WriteLine("Click-offset: {0} MouseDown split position: {1}", click_offset, split_position);
#endif
// Draw our initial handle
DrawDragHandle(DrawType.Initial);
}
protected override void OnMouseMove(MouseEventArgs e) {
Point pt;
base.OnMouseMove (e);
if (!Capture || e.Button != MouseButtons.Left) {
return;
}
// We need our mouse coordinates relative to our parent
pt = PointToScreen(parent.PointToClient(new Point(e.X, e.Y)));
// Grab our new coordinates
prev_split_position = split_position;
if (horizontal) {
split_position = pt.Y;
} else {
split_position = pt.X;
}
// Enforce limits
if (split_position < limit_min) {
#if Debug
Console.WriteLine("SplitPosition {0} less than minimum {1}, setting to minimum", split_position, limit_min);
#endif
split_position = limit_min;
} else if (split_position > limit_max) {
#if Debug
Console.WriteLine("SplitPosition {0} more than maximum {1}, setting to maximum", split_position, limit_max);
#endif
split_position = limit_max;
}
// Don't waste cycles
if (prev_split_position != split_position) {
// Update our handle location
DrawDragHandle(DrawType.Redraw);
}
// Prepare the event
if (horizontal) {
sevent.split_x = 0;
sevent.split_y = split_position;
} else {
sevent.split_x = split_position;
sevent.split_y = 0;
}
sevent.x = pt.X;
sevent.y = pt.Y;
// Fire the event
OnSplitterMoving(sevent);
}
protected override void OnMouseUp(MouseEventArgs e) {
if (!Capture || e.Button != MouseButtons.Left) {
base.OnMouseUp (e);
return;
}
Capture = false;
DrawDragHandle(DrawType.Finish);
// Resize the affected window
if (horizontal) {
affected.Height = CalculateSplitPosition() - click_offset;
#if Debug
Console.WriteLine("Setting height of affected control to {0}", CalculateSplitPosition() - click_offset);
#endif
} else {
affected.Width = CalculateSplitPosition() - click_offset;
#if Debug
Console.WriteLine("Setting width of affected control to {0}", CalculateSplitPosition() - click_offset);
#endif
}
base.OnMouseUp (e);
// It seems that MS is sending some data that doesn't quite make sense
// In this event. It tried to match their stuff.., not sure about split_x...
// Prepare the event
if (horizontal) {
sevent.x = 0;
sevent.y = split_position;
sevent.split_x = 200;
sevent.split_y = split_position;
} else {
sevent.x = split_position;
sevent.y = 0;
sevent.split_x = split_position;
sevent.split_y = 200;
}
// Fire the event
OnSplitterMoved(sevent);
}
protected virtual void OnSplitterMoved(SplitterEventArgs sevent) {
if (SplitterMoved != null) {
SplitterMoved(this, sevent);
}
}
protected virtual void OnSplitterMoving(SplitterEventArgs sevent) {
if (SplitterMoving != null) {
SplitterMoving(this, sevent);
}
}
protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified) {
// enforce our width / height
if (horizontal) {
base.SetBoundsCore (x, y, width, splitter_size, specified);
} else {
base.SetBoundsCore (x, y, splitter_size, height, specified);
}
}
#endregion // Protected Instance Methods
#region Private Properties and Methods
private Control AffectedControl {
get {
if (parent == null) {
return null;
}
// Doc says the first control preceeding us in the zorder
for (int i = parent.Controls.GetChildIndex(this) + 1; i < parent.Controls.Count; i++) {
switch(this.Dock) {
case DockStyle.Top: {
if (Top == parent.Controls[i].Bottom) {
return parent.Controls[i];
}
break;
}
case DockStyle.Bottom: {
if (Bottom == parent.Controls[i].Top) {
return parent.Controls[i];
}
break;
}
case DockStyle.Left: {
if (Left == parent.Controls[i].Right) {
return parent.Controls[i];
}
break;
}
case DockStyle.Right: {
if (Right == parent.Controls[i].Left) {
return parent.Controls[i];
}
break;
}
}
}
return null;
}
}
private Control FillerControl {
get {
if (parent == null) {
return null;
}
// Doc says the first control preceeding us in the zorder
for (int i = parent.Controls.GetChildIndex(this) - 1; i >= 0; i--) {
if (parent.Controls[i].Dock == DockStyle.Fill) {
return parent.Controls[i];
}
}
return null;
}
}
private int CalculateSplitPosition() {
if (horizontal) {
if (dock_style == DockStyle.Top) {
return split_position;
} else {
return affected.Bottom - split_position - splitter_size;
}
} else {
if (dock_style == DockStyle.Left) {
return split_position;
} else {
return affected.Right - split_position - splitter_size;
}
}
}
private void PaintSplitter(object sender, PaintEventArgs e) {
e.Graphics.FillRectangle(ThemeEngine.Current.ResPool.GetSolidBrush(this.BackColor), e.ClipRectangle);
}
private void LayoutSplitter(object sender, LayoutEventArgs e) {
affected = AffectedControl;
filler = FillerControl;
}
private void DrawDragHandle(DrawType type) {
Rectangle prev;
Rectangle current;
if (horizontal) {
prev = new Rectangle(0, prev_split_position - click_offset + 1, Width, 0);
current = new Rectangle(0, split_position - click_offset + 1, Width, 0);
} else {
prev = new Rectangle(prev_split_position - click_offset + 1, 0, 0, Height);
current = new Rectangle(split_position - click_offset + 1, 0, 0, Height);
}
switch(type) {
case DrawType.Initial: {
XplatUI.DrawReversibleRectangle(Parent.window.Handle, current, 3);
return;
}
case DrawType.Redraw: {
if (prev.X == current.X && prev.Y == current.Y) {
return;
}
XplatUI.DrawReversibleRectangle(Parent.window.Handle, prev, 3);
XplatUI.DrawReversibleRectangle(Parent.window.Handle, current, 3);
return;
}
case DrawType.Finish: {
XplatUI.DrawReversibleRectangle(Parent.window.Handle, prev, 3);
return;
}
}
}
#endregion // Private Properties and Methods
#region Events
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler BackgroundImageChanged;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler Enter;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler FontChanged;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler ForeColorChanged;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler ImeModeChanged;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event KeyEventHandler KeyDown;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event KeyPressEventHandler KeyPress;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event KeyEventHandler KeyUp;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler Leave;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler TabStopChanged;
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler TextChanged;
public event SplitterEventHandler SplitterMoved;
public event SplitterEventHandler SplitterMoving;
#endregion // Events
}
}
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