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| Re: Can I get mouse position inside widget [message #446129 is a reply to message #446123] |
Wed, 17 November 2004 16:05   |
 Veronika Irvine
Messages: 1272
Registered: July 2009 |
Senior Member |
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See Display.map():
/**
* Maps a point from one coordinate system to another.
* When the control is null, coordinates are mapped to
* the display.
* <p>
* NOTE: On right-to-left platforms where the coordinate
* systems are mirrored, special care needs to be taken
* when mapping coordinates from one control to another
* to ensure the result is correctly mirrored.
*
* Mapping a point that is the origin of a rectangle and
* then adding the width and height is not equivalent to
* mapping the rectangle. When one control is mirrored
* and the other is not, adding the width and height to a
* point that was mapped causes the rectangle to extend
* in the wrong direction. Mapping the entire rectangle
* instead of just one point causes both the origin and
* the corner of the rectangle to be mapped.
* </p>
*
* @param from the source <code>Control</code> or <code>null</code>
* @param to the destination <code>Control</code> or <code>null</code>
* @param x coordinates to be mapped
* @param y coordinates to be mapped
* @return point with mapped coordinates
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the Control from or the Control to have
been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that
created the receiver</li>
* <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 2.1.2
*/
public Point map (Control from, Control to, int x, int y) {
See also:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.sni ppets/src/org/eclipse/swt/snippets/Snippet91.java?rev=HEAD&a mp;content-type=text/vnd.viewcvs-markup
"Andy Doddington" <andy@doddington.net> wrote in message
news:cnfore$l3j$1@www.eclipse.org...
>I am writing a DropTargetListener for a Tree control and wish to find out
>where the mouse is relative to each TreeItem widget. THis is to that I can
>distinguihs between sibling-type inserts and child-type inserts, which are
>otherwise indistinguishable - as far as I can work out.
>
> I can get the display position from the event, along with the widget
> itself, but there does not appear to be any way of obtaining the location
> of the widget in any form that relates to the mouse position.
> The event coordinates are relative to the display, which is fine, but all
> of the widget details are relative to the widget itself - e.g. its
> location is always set to (0,0).
>
> Does anyone have any ideas as to how I can get the location of the widget
> relative to the display (or any other common reference point)?
>
> Note that since the widget is not a Control, I cannot use methods like
> toDisplay or toControl to re-map the mouse coordinates.
>
> Any info most appreciated.
>
> Regards,
>
> Andy D
>
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| Re: Can I get mouse position inside widget [message #446135 is a reply to message #446129] |
Wed, 17 November 2004 17:11 |
Andy Doddington
Messages: 17
Registered: July 2009 |
Junior Member |
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|
Many thanks Veronica - that has solved my problem!
Cheers,
Andy D
Veronika Irvine wrote:
> See Display.map():
> /**
> * Maps a point from one coordinate system to another.
> * When the control is null, coordinates are mapped to
> * the display.
> * <p>
> * NOTE: On right-to-left platforms where the coordinate
> * systems are mirrored, special care needs to be taken
> * when mapping coordinates from one control to another
> * to ensure the result is correctly mirrored.
> *
> * Mapping a point that is the origin of a rectangle and
> * then adding the width and height is not equivalent to
> * mapping the rectangle. When one control is mirrored
> * and the other is not, adding the width and height to a
> * point that was mapped causes the rectangle to extend
> * in the wrong direction. Mapping the entire rectangle
> * instead of just one point causes both the origin and
> * the corner of the rectangle to be mapped.
> * </p>
> *
> * @param from the source <code>Control</code> or <code>null</code>
> * @param to the destination <code>Control</code> or <code>null</code>
> * @param x coordinates to be mapped
> * @param y coordinates to be mapped
> * @return point with mapped coordinates
> *
> * @exception IllegalArgumentException <ul>
> * <li>ERROR_INVALID_ARGUMENT - if the Control from or the Control to have
> been disposed</li>
> * </ul>
> * @exception SWTException <ul>
> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that
> created the receiver</li>
> * <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
> * </ul>
> *
> * @since 2.1.2
> */
> public Point map (Control from, Control to, int x, int y) {
> See also:
>
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.sni ppets/src/org/eclipse/swt/snippets/Snippet91.java?rev=HEAD&a mp;content-type=text/vnd.viewcvs-markup
> "Andy Doddington" <andy@doddington.net> wrote in message
> news:cnfore$l3j$1@www.eclipse.org...
>>I am writing a DropTargetListener for a Tree control and wish to find out
>>where the mouse is relative to each TreeItem widget. THis is to that I can
>>distinguihs between sibling-type inserts and child-type inserts, which are
>>otherwise indistinguishable - as far as I can work out.
>>
>> I can get the display position from the event, along with the widget
>> itself, but there does not appear to be any way of obtaining the location
>> of the widget in any form that relates to the mouse position.
>> The event coordinates are relative to the display, which is fine, but all
>> of the widget details are relative to the widget itself - e.g. its
>> location is always set to (0,0).
>>
>> Does anyone have any ideas as to how I can get the location of the widget
>> relative to the display (or any other common reference point)?
>>
>> Note that since the widget is not a Control, I cannot use methods like
>> toDisplay or toControl to re-map the mouse coordinates.
>>
>> Any info most appreciated.
>>
>> Regards,
>>
>> Andy D
>>
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