DirectXFormBase.HtmlElementMouseUp Event
Occurs when a mouse button pressed over an element of an HTML-CSS template is released.
Namespace: DevExpress.XtraEditors
Assembly: DevExpress.Utils.v24.1.dll
NuGet Packages: DevExpress.Utils, DevExpress.Wpf.Core
Declaration
Event Data
The HtmlElementMouseUp event's data class is DxHtmlElementMouseEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
Bounds | Returns actual bounds of a clicked element. The returned value depends on the screen scaling. For example, the Bounds property for a square div element with 50px sides returns Height and Width values of 100px when shown on a display with a 200% Windows scaling option. |
Bubbles | Returns whether this element can pass an event up along the tree, to its parent HTML elements. You can enable the CancelBubble property to stop an event at this control level. See any “HtmlElementMouse~” event description for more details on bubbling (for example, WinExplorerView.HtmlElementMouseClick). Inherited from DxHtmlElementEventArgs. |
Button | Returns the clicked mouse button. |
CancelBubble | Specifies whether this element should pass an event to its parent elements. See any “HtmlElementMouse~” event description for more information about bubbling (for example, WinExplorerView.HtmlElementMouseClick). Inherited from DxHtmlElementEventArgs. |
Clicks | Returns the number of clicks. |
CurrentTarget | Inherited from DxHtmlElementEventArgs. |
Element | Inherited from DxHtmlElementEventArgs. |
ElementId | Returns the unique identifier of an HTML element. Element IDs are set in HTML markup (the “id” property). See any “HtmlElementMouse~” event description for more information (for example, WinExplorerView.HtmlElementMouseClick). Inherited from DxHtmlElementEventArgs. |
HitInfo | Returns information about a clicked element. |
IsClick | |
MouseArgs | Returns information about a mouse pointer. |
NodeName | Inherited from DxHtmlElementEventArgs. |
RootElement | Inherited from DxHtmlElementEventArgs. |
SourceItem | |
SuppressOwnerEvent | Specifies whether a control whose HTML element triggered this event should raise its own related event. See any “HtmlElementMouse~” event description for more information (for example, WinExplorerView.HtmlElementMouseClick). Inherited from DxHtmlElementEventArgs. |
TagName | Inherited from DxHtmlElementEventArgs. |
Target | Inherited from DxHtmlElementEventArgs. |
X | Returns the X coordinate of a mouse pointer. |
Y | Returns the Y coordinate of a mouse pointer. |
The event data class exposes the following methods:
Method |
---|
HasClassName(String, Boolean) |
HasId(String, Boolean) |
HasTag(String, Boolean) |
Remarks
Objects of the DxHtmlElementMouseEventArgs class (and its parent DxHtmlElementEventArgs class) are used inside events and methods that allow you to handle user interactions with HTML elements.
Common Properties
X, Y, Clicks, and Button properties return information about mouse clicks: the mouse button that was clicked, the coordinates of the mouse pointer, and the number of clicks.
You can also read the MouseArgs property to get the same information in an aggregated MouseEventArgs object.
The Bounds property returns the location and actual screen size of an HTML element. For example, the Bounds property for a square <div>
element with 50px sides returns Height
and Width
values of 100 when shown on a display with a 200% Windows scaling option.
Element ID
When you handle template-related control events (for example, HtmlContentControl.ElementMouseClick), these events are raised for any HTML element with which a user interacts.
<div class='buttonPanel'>
<img src="PhoneCall" />
<img src="VideoCall" />
<img src="Message" />
</div>
htmlContentControl.ElementMouseClick += (s, e) => {
// Raises for all three IMG elements
};
To identify which element has triggered an event, assign unique IDs in HTML markup.
<div class='buttonPanel'>
<img id="btnPhone" src="PhoneCall"/>
<img id="btnVideo" src="VideoCall"/>
<img id="btnText" src="Message"/>
</div>
Then you can check the ElementId property value to identify HTML elements.
htmlContentControl.ElementMouseClick += (s, e) => {
if(e.ElementId == "btnPhone")
// Action #1
if(e.ElementId == "btnVideo")
// Action #2
if(e.ElementId == "btnText")
// Action #3
};
Bubbling
The following markup illustrates four <div>
elements nested one inside the other. Each element has its own onclick
method called when users click this specific element.
<div class="container1" onclick="func1">
<div class="container2" onclick="func2">
<div class="container3" onclick="func3">
<div class="container4" onclick="func4">
Click Me
</div>
</div>
</div>
</div>
/* Important
* Event handlers must be defined within a container control that hosts the HtmlContentControl.
*/
public partial class Form1 : DevExpress.XtraEditors.XtraForm {
// ...
void func1(object sender, DxHtmlElementMouseEventArgs args) {
// Action #1
}
void func2(object sender, DxHtmlElementMouseEventArgs args) {
// Action #2
}
}
Important
Event handlers must be defined within a container control that hosts the HtmlContentControl
(for example, a form or user control).
When a user clicks any element, the onclick
method of this element fires first. After that, each parent HTML element subsequently calls its own onclick
method. For example, if a user clicked the inner div
element with the container4
style, all four methods are called in a sequence (func4 - func3 - func2 - func1).
This process of subsequent child-to-parent element activation is called bubbling, similar to how a bubble of air floats up in the water. The Bubbles property allows you to identify whether an element can pass the mouse event up through the elements tree. You can set the CancelBubble property to true to stop bubbling at this element.
void func1(object sender, DxHtmlElementMouseEventArgs args) {
// Not called automatically when the element with "func2" is clicked
}
void func2(object sender, DxHtmlElementMouseEventArgs args) {
args.CancelBubble = true;
}
Note that the Bubbles
property is an indicator that tells you whether this element has parent elements that can potentially handle the corresponding mouse event. If so, this property returns true even if you enable the CancelBubble
property.
Suppress Control Events
When a user interacts with an HTML & CSS template element, a mouse event bubbles up through the elements tree and finally reaches the templated control itself. For example, when a Data Grid template element is clicked, Data Grid events fire after a sequence of element onclick
methods (for instance, BaseView.Click).
You can enable the SuppressOwnerEvent property to prevent mouse events from reaching a control. In this case the control will not fire its native events.