/// <summary>
/// This method and its overloads can be used to simplify adding data bindings to controls contained in
/// the template.
/// </summary>
/// <param name="control">The control to which to add the data binding</param>
/// <param name="controlProperty">The name of the control property to bind</param>
/// <param name="dataMember">The property or list to which to bind</param>
/// <param name="clearBindings">Specify true to clear all existing bindings before adding the new binding
/// or false to keep all existing bindings.</param>
/// <param name="formatEvent">An event handler for the binding's <c>Format</c> event if wanted</param>
/// <param name="parseEvent">An event handler for the binding's <c>Parse</c> event if wanted</param>
/// <remarks>This version will only clear the existing data bindings if the <c>clearBindings</c>
/// parameter is true. It will also add the specified format and parse event handlers to the binding if
/// they are specified. Use null if you do not want a particular handler added.</remarks>
/// <returns>The newly created data binding</returns>
/// <exception cref="ArgumentNullException">This is thrown if the control parameter is null</exception>
public Binding AddBinding(Control control, string controlProperty, string dataMember, bool clearBindings,
ConvertEventHandler formatEvent, ConvertEventHandler parseEvent)
{
if (control == null)
{
throw new ArgumentNullException("control", LR.GetString("ExNullParameter"));
}
Binding b = new Binding(controlProperty, rowSource, dataMember);
if (formatEvent != null)
{
b.Format += formatEvent;
}
if (parseEvent != null)
{
b.Parse += parseEvent;
}
if (clearBindings)
{
control.DataBindings.Clear();
}
control.DataBindings.Add(b);
return(b);
}
/// <summary>
/// Sets the check state of the item at the specified index to the specified value
/// </summary>
/// <param name="index">The index of the item to change</param>
/// <param name="state">The new check state of the item</param>
/// <exception cref="ArgumentOutOfRangeException">This is thrown if the index value is not within the
/// bounds of the item collection.</exception>
/// <overloads>There are two overloads for this method</overloads>
public void SetItemCheckState(int index, CheckState state)
{
if (index < 0 || index >= this.Items.Count)
{
throw new ArgumentOutOfRangeException("index", index, LR.GetString("ExItemIndexOutOfRange"));
}
((CheckBox)this.ButtonPanel.Controls[index]).CheckState = state;
}
/// <summary>
/// Returns a value indicating whether the specified item is checked
/// </summary>
/// <param name="index">The index of the item to examine</param>
/// <returns>True if the item is checked, false if it is not</returns>
/// <exception cref="ArgumentOutOfRangeException">This is thrown if the index value is not within the
/// bounds of the item collection.</exception>
/// <overloads>There are two overloads for this method</overloads>
public bool GetItemChecked(int index)
{
if (index < 0 || index >= this.Items.Count)
{
throw new ArgumentOutOfRangeException("index", index, LR.GetString("ExItemIndexOutOfRange"));
}
return(((CheckBox)this.ButtonPanel.Controls[index]).Checked);
}
/// <summary>
/// Returns a value indicating the current check state of the item with the specified value
/// </summary>
/// <param name="key">The item in the data source to examine. The <see cref="BaseListControl.ValueMember"/>
/// is searched for this value.</param>
/// <returns>The current check state of the specified item</returns>
/// <exception cref="ArgumentOutOfRangeException">This is thrown if the value is not found in the
/// collection.</exception>
public CheckState GetItemCheckState(object key)
{
int index = this.Find(key);
if (index == -1)
{
throw new ArgumentOutOfRangeException("key", key, LR.GetString("ExItemIndexOutOfRange"));
}
return(((CheckBox)this.ButtonPanel.Controls[index]).CheckState);
}
//=====================================================================
/// <summary>
/// This is called to force the control to refresh the checkboxes with information from the data source
/// </summary>
/// <exception cref="InvalidOperationException">This is thrown if a <see cref="BindingMembersDataSource"/>
/// has been specified and there are more checkbox list items that members specified in
/// <see cref="BindingMembers"/>.</exception>
public override void RefreshSubControls()
{
Panel bp = this.ButtonPanel;
Binding b;
CheckBox cb;
CheckState[] states;
int idx = 0, imageIdx = 0, memberIdx = 0;
ControlCollection cc = bp.Controls;
states = new CheckState[cc.Count];
// Dispose of any prior checkboxes
while (cc.Count > 0)
{
cb = (CheckBox)cc[0];
states[idx] = cb.CheckState;
cb.Enter -= CheckBox_Enter;
cb.CheckStateChanged -= CheckBox_CheckStateChanged;
cc.RemoveAt(0);
cb.Dispose();
idx++;
}
idx = 0;
foreach (object oItem in this.Items)
{
cb = new CheckBox();
// In .NET 2.0, we could use the UseMnemonic property but it doesn't work with FlatStyle.System
// so we'll modify the text which works with it and with .NET 1.1.
if (this.UseMnemonic)
{
cb.Text = this.GetItemText(oItem).Replace("&&", "&");
}
else
{
cb.Text = this.GetItemText(oItem).Replace("&", "&&");
}
cb.Appearance = base.Appearance;
cb.FlatStyle = this.FlatStyle;
cb.ThreeState = threeState;
cb.CheckAlign = base.CheckAlign;
cb.TextAlign = base.TextAlign;
cb.ImageAlign = base.ImageAlign;
cb.ImageList = base.ImageList;
// Don't hook up the event in design mode. They are clickable. We'll also skip hooking up the
// data bindings.
if (!this.DesignMode)
{
cb.Enter += CheckBox_Enter;
cb.CheckStateChanged += CheckBox_CheckStateChanged;
// If we have a data source and available members, bind the checkbox's CheckState to the
// member.
if (bindingDataSource != null)
{
if (memberIdx < bindingMembers.Count)
{
if (bindingContext != null)
{
cb.BindingContext = bindingContext;
}
b = new Binding("CheckState", bindingDataSource, bindingMembers[memberIdx]);
b.Format += BindingMember_Format;
b.Parse += BindingMember_Parse;
cb.DataBindings.Add(b);
memberIdx++;
}
else
{
throw new InvalidOperationException(LR.GetString("ExTooFewBindingMembers"));
}
}
}
if (base.ImageList != null)
{
cb.ImageIndex = imageIdx;
imageIdx++;
// Wrap the index if there are more items than images
if (imageIdx == base.ImageList.Images.Count)
{
imageIdx = 0;
}
}
// Restore the state if necessary
if (this.SelectedIndex != -1 && idx < states.Length)
{
cb.CheckState = states[idx];
}
bp.Controls.Add(cb);
idx++;
}
base.RefreshSubControls();
this.PerformLayout();
}
/// <summary>
/// This is used to bind controls to the row source. Derived controls must override this to provide data
/// binding support even if they contain no bound controls.
/// </summary>
/// <remarks>This will not be called until the template is scrolled into view. This saves time and
/// resources during the initial startup phase of a form that contains a data list control. Templates
/// are re-bound under many conditions. If adding bindings to controls manually, be sure to clear the
/// <c>DataBindings</c> collection on all bound controls first. A better alternative is to use the
/// overloaded <see cref="AddBinding(Control, string, string)"/> method as it will take care of that for
/// you.</remarks>
/// <exception cref="NotImplementedException">This is thrown if the method is not overridden and the base
/// implementation is called.</exception>
/// <example>
/// <code language="cs">
/// protected override void Bind()
/// {
/// this.AddBinding(txtFName, "Text", "FirstName");
/// this.AddBinding(txtLName, "Text", "LastName");
/// this.AddBinding(txtAddress, "Text", "Address");
/// this.AddBinding(txtCity, "Text", "City");
/// this.AddBinding(cboState, "SelectedValue", "State");
/// this.AddBinding(txtZip, "Text", "Zip");
/// this.AddBinding(udcSumValue, "Text", "SumValue");
/// }
/// </code>
/// <code language="vbnet">
/// Protected Overrides Sub Bind()
/// Me.AddBinding(txtFName, "Text", "FirstName")
/// Me.AddBinding(txtLName, "Text", "LastName")
/// Me.AddBinding(txtAddress, "Text", "Address")
/// Me.AddBinding(txtCity, "Text", "City")
/// Me.AddBinding(cboState, "SelectedValue", "State")
/// Me.AddBinding(txtZip, "Text", "Zip")
/// Me.AddBinding(udcSumValue, "Text", "SumValue")
/// End Sub
/// </code>
/// </example>
protected internal virtual void Bind()
{
throw new NotImplementedException(LR.GetString("TCBindNotOverridden", this.GetType().Name));
}
/// <summary>
/// Handle vertical scroll to make it smoother
/// </summary>
/// <remarks>The default scrolling increments are quite small and the frequent redraws cause a messy
/// display when the thumb is dragged. By handling it ourselves, we can initialize and bind the rows
/// before they are displayed and can also control the increments to provide a smoother scroll with a
/// cleaner visual appearance.</remarks>
/// <param name="m">The vertical scroll message parameters</param>
private void HandleVerticalScroll(ref Message m)
{
TemplateControl tc;
DataList owner = (DataList)this.Parent;
Rectangle clientRect = base.ClientRectangle, displayRect = base.DisplayRectangle;
int row, fillRange, maxRows, multiplier, rowHeight = owner.RowHeight, curPos = -displayRect.Y;
int maxPos = -(clientRect.Height - displayRect.Height - rowHeight), scrollEvent = (int)m.WParam & 0xFFFF;
switch (scrollEvent)
{
case 0: // Line up
if (curPos <= 0)
{
curPos = 0;
}
else
{
curPos -= rowHeight;
}
break;
case 1: // Line down
if (curPos >= maxPos - rowHeight)
{
curPos = maxPos;
}
else
{
curPos += rowHeight;
}
break;
case 2: // Page up
if (curPos <= clientRect.Height)
{
curPos = 0;
}
else
{
curPos -= clientRect.Height;
}
break;
case 3: // Page down
if (curPos >= maxPos - clientRect.Height)
{
curPos = maxPos;
}
else
{
curPos += clientRect.Height;
}
break;
case 4: // Thumb position (end tracking)
case 5: // Thumb track (drag)
if (scrollTip == null)
{
scrollTip = new NativeToolTipWindow(this);
}
// Round it to the nearest row start and show the position in a tool tip
curPos = UnsafeNativeMethods.ScrollThumbPosition(base.Handle, 1) / rowHeight * rowHeight;
scrollTip.ShowTooltip(String.Format(CultureInfo.InvariantCulture, LR.GetString("DLScrollPos"),
(curPos / rowHeight) + 1, owner.RowCount));
break;
case 6: // Top
curPos = 0;
break;
case 7: // Bottom
curPos = maxPos;
break;
case 8: // End scroll
if (scrollTip != null && scrollTip.IsVisible)
{
scrollTip.HideTooltip();
}
break;
case 32767: // Custom call to scroll row into view
curPos = m.LParam.ToInt32();
if (curPos < 0)
{
curPos = 0;
}
else
if (curPos >= maxPos)
{
curPos = maxPos;
}
break;
}
// Ignore if not displaying content while scrolling and it was a thumb tracking event
if (this.GetScrollState(0x10) || scrollEvent != 5)
{
// Initialize and bind the rows before they are displayed to smooth out the scrolling
multiplier = (owner.SeparatorsVisible) ? 2 : 1;
if (owner.ListManager != null && this.Controls.Count != 0)
{
maxRows = owner.ListManager.Count;
// Get the range of visible rows
row = curPos / rowHeight;
fillRange = ((curPos + rowHeight + this.Height) / rowHeight) + 1;
if (fillRange < maxRows)
{
maxRows = fillRange;
}
}
else
{
row = maxRows = 0;
}
while (row < maxRows)
{
if (row * multiplier < this.Controls.Count)
{
tc = (TemplateControl)this.Controls[row * multiplier];
}
else
{
tc = null;
}
// By waiting until the templates scroll into view, it saves some time and resources during
// the initial load and only binds what is actually shown.
if (tc != null && !tc.IsNewRowInternal && !tc.HasBeenBound)
{
if (!tc.HasBeenInitialized)
{
tc.InitializeTemplate();
tc.HasBeenInitialized = true;
}
tc.Bind();
tc.HasBeenBound = true;
owner.OnItemDataBound(new DataListEventArgs(row, tc));
}
row++;
}
// Set "user scrolled" flag and update the display rectangle
this.SetScrollState(8, true);
this.SetDisplayRectLocation(displayRect.X, -curPos);
if (syncScrollbars != null)
{
syncScrollbars.Invoke(this, new object[] { this.AutoScroll });
}
// Refresh the row headers if they are visible
if (owner.RowHeadersVisible)
{
owner.Invalidate(new Rectangle(0, 0, owner.RowHeaderWidth, owner.Height), false);
}
}
if (scrollEvent != 8)
{
ScrollEventArgs se = new ScrollEventArgs((ScrollEventType)scrollEvent, -displayRect.Y, curPos,
ScrollOrientation.VerticalScroll);
base.OnScroll(se);
}
}