Questions on UI for WinForms Forum

6 answers

718 views

How to disable MouseWheel for RadDateTimePicker

My application has a RadDateTimePicker at the top of most forms; often the forms require some scrolling. When a user enters the form, the RadDateTimePicker gets focus, and then when he tries to scroll down the form, he instead will inadvertently scroll the date, then (when the month reaches 12, its highest value) the form will scroll. The user often will not know that he accidently changed a value.

My users never want to scroll the date (they are always surprised when I point out to them that it does scroll), so I want to turn off that functionality. My first thought was to get the event handler and set Handled to true ... but there is no such property on that event handler. Then, even though I knew better, I tried to go down the road of removing the existing handlers ... but even Reflection balks at that.

So, is there a way for me to disable the MouseWheel event in the RadDateTimePicker? Or do you have alternate suggestions?

Thanks!

Calendar, DateTimePicker, TimePicker and Clock

answered on 04 Dec 2015

1 answer

382 views

RadGridView.RowFormatting Bug?

Hi,

I'm formatting my RadGridView and changing its color based a cell value. It's working fine but if I scroll up or down It becomes to change all rows color.

Is it a bug, or I'm doing something wrong?

Here is my code:

Thank you.

Private Sub grid_RowFormatting(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.RowFormattingEventArgs)
e.RowElement.RowInfo.MinHeight = 24
If e.RowElement.RowInfo.Cells("Recusa").Value = "S" Then
e.RowElement.ForeColor = Color.DarkRed
e.RowElement.BackColor = Color.Coral
End If
End Sub

GridView

answered on 04 Dec 2015

7 answers

2.0K+ views

How to restrict user from setting negative values to editable decimal column.

I have a gridview with one text column and five decimal columns. These decimal columns are editable. So inorder to edit this, the user can directly enter values or use the up and down buttons to increase or decrease values. My requirement is to restrict user from setting negative values by pressing the down button of the decimal column. How to achieve this?

GridView

answered on 04 Dec 2015

1 answer

645 views

RadButton's Border does not show

I have set the button's top border color to be red and bottom border color to be yellow by the below codes but the appearance never show the border colors when running.

this.ButtonElement.BorderElement.BoxStyle = BorderBoxStyle.FourBorders;
this.ButtonElement.BorderElement.TopColor = Color.Red;
this.ButtonElement.BorderElement.TopWidth = 2;
this.ButtonElement.BorderElement.BottomColor = Color.Yellow;
this.ButtonElement.BorderElement.BottomWidth = 2;

Please help me to solve this problem.

Buttons, RadioButton, CheckBox, etc

answered on 03 Dec 2015

1 answer

174 views

RadDropDownListElement - Tooltip

Hi,

I am trying to add a tooltip to a RadDropDownListElement embedded in a Ribbonbar.

One may add tooltip text directly, to the ListElement or to the Textbox, but no one results in a tooltip being displayed.

I do not wish to add tooltip to individual items in the dropdownlist, but just one tooltip to the entire control.

Any advice?

/Brian

RibbonBar

answered on 03 Dec 2015

1 answer

117 views

GridViewCheckedDropDownListColumn

I am trying to create a GridViewCheckedDropDownListColumn. I have some of it working.

It is creating the column and the drop-down is displaying as it should. However, the main cell does not show the checked items after the drop-down is no longer displayed. Nor does it remember which items had previously been checked when the drop-down is displayed a second time.

I wasn't able to attach my project, so here is the important code:

public class Foo

{

public int Id { get; set; }

public string Value { get; set; }

public bool IsSelected { get; set; }

}

public class Boo : Foo

{

public List<Foo> Foos { get; set; }

public Boo()

{

this.Foos = new List<Foo>();

}

public class RadCheckedDropDownListEditorElement : RadCheckedDropDownListElement

{

...

}

public class RadCheckedDropDownListEditor : BaseGridEditor

{

public string ValueMember { get; set; }

public string DisplayMember { get; set; }

public string CheckedMember { get; set; }

public override object Value

{

get

{

var listEditorElement = (RadCheckedDropDownListElement) this.EditorElement;

return listEditorElement.DataSource;

}

set

{

var listEditorElement = (RadCheckedDropDownListElement) this.EditorElement;

listEditorElement.ValueMember = this.ValueMember;

listEditorElement.DisplayMember = this.DisplayMember;

listEditorElement.CheckedMember = this.CheckedMember;

listEditorElement.DataSource = value;

}

[AttributeProvider(typeof(IListSource))]

[RadDescription("DataSource", typeof(RadListElement))]

[Category("Data")]

[RadDefaultValue("DataSource", typeof(RadListElement))]

public object DataSource

{

get

{

var listEditorElement = (RadCheckedDropDownListElement)this.EditorElement;

return listEditorElement.DataSource;

}

set

{

var listEditorElement = (RadCheckedDropDownListElement)this.EditorElement;

listEditorElement.DataSource = value;

}

protected override RadElement CreateEditorElement()

{

return new RadCheckedDropDownListEditorElement();

}

public class GridViewCheckedDropDownListColumn : GridViewComboBoxColumn

{

private RadCheckedDropDownListEditor _editor;

private string _checkedMember;

[Browsable(true)]

[Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]

[Category("Data")]

[DefaultValue(null)]

[Description("Gets or sets a string that specifies the property or database column from which to get values that correspond to the items in the RadDropDownListEditor.")]

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

public string CheckedMember

{

get

{

return this._checkedMember;

}

set

{

if (this._checkedMember == value) return;

this._checkedMember = value;

this.DispatchEvent(KnownEvents.ColumnDataSourceInitializing, GridEventType.UI, GridEventDispatchMode.Send, (object)null, (object[])null);

}

public GridViewCheckedDropDownListColumn()

{

}

public GridViewCheckedDropDownListColumn(string fieldName) : base(fieldName)

{

}

public GridViewCheckedDropDownListColumn(string uniqueName, string fieldName) : base(uniqueName, fieldName)

{

}

public override Type GetDefaultEditorType()

{

return typeof(RadCheckedDropDownListEditor);

}

public override IInputEditor GetDefaultEditor()

{

return new RadCheckedDropDownListEditor();

}

public override void InitializeEditor(IInputEditor editor)

{

var dropDownListEditor = (RadCheckedDropDownListEditor) editor;

if (dropDownListEditor == null) return;

dropDownListEditor.ValueMember = this.ValueMember;

dropDownListEditor.DisplayMember = this.DisplayMember;

dropDownListEditor.CheckedMember = this.CheckedMember;

dropDownListEditor.DataSource = this.DataSource;

}

public virtual void RadGridView_EditorRequired(object sender, EditorRequiredEventArgs e)

{

if (e.EditorType == typeof(RadCheckedDropDownListEditor))

{

e.Editor = this._editor ?? (this._editor = new RadCheckedDropDownListEditor());

}

public partial class Form1 : Form

{

private List<Boo> _boos;

public Form1()

{

this.InitializeComponent();

this.InitializeList();

this.InitializeColumns();

this.radGridView.DataSource = this._boos;

}

private void InitializeList()

{

this._boos = new List<Boo>();

for (int i = 0; i < 10; i++)

{

Boo b = new Boo

{

Id = i,

Value = $"Boo-{i}"

};

for (int j = 0; j < 10; j++)

{

Foo f = new Foo

{

Id = j,

Value = $"Foo-{i}.{j}"

};

b.Foos.Add(f);

}

this._boos.Add(b);

}

private void InitializeColumns()

{

var c1 = new GridViewTextBoxColumn(nameof(Boo.Id));

var c2 = new GridViewTextBoxColumn(nameof(Boo.Value));

var c3 = new GridViewCheckedDropDownListColumn(nameof(Boo.Foos))

{

ValueMember = nameof(Foo.Id),

DisplayMember = nameof(Foo.Value),

CheckedMember = nameof(Foo.IsSelected),

Width = 500

};

this.radGridView.Columns.Add(c1);

this.radGridView.Columns.Add(c2);

this.radGridView.Columns.Add(c3);

this.radGridView.EditorRequired += c3.RadGridView_EditorRequired;

}

GridView

answered on 03 Dec 2015

7 answers

1.5K+ views

Text wrapping in a tree view node and multi line support

Hi,

I am using a RadTreeView to display a set of nodes where the text is very long. Is it possible to specify a max width for the treeview node and have the text wrap within the available space extending down (or clipping beyond the horizontal size).

(I have read some other posts on this but there is nothing in there for this year)

Regards
James

Treeview

answered on 02 Dec 2015

1 answer

167 views

RadGridView Hearder Click

Hi,

I need to do some action when the user clicks with the right button on the radgridview, but ignoring header clicks.

How can I identify header clicks?

PS: I'm using MouseClick event.

Thank you.

ChartView