I have a bar graph and I want to allow the user to right click a particular bar, select some operation (add one or anything really) that will affect only that bar. Is this type of thing possible using ZedGraph?
You can add a Mouse Click event to the Form and call FindNearestObject() passing in that mouse point, you'll get back the nearest object. Something like this perhaps:
private void zedGraphControl2_MouseClick(object sender, MouseEventArgs e)
{
object nearestObject;
int index;
this.zedGraphControl2.GraphPane.FindNearestObject(new PointF(e.X, e.Y), this.CreateGraphics(), out nearestObject, out index);
if (nearestObject != null && nearestObject.GetType() == typeof(BarItem))
{
BarItem barItem = (BarItem)nearestObject;
barItem[index].Y += 1;
zedGraphControl2.Invalidate();
}
}
Related
The default behavior for the Slider.ValueChanged event is to trigger ValueChanged multiple times as the user drags the control. Is there a way to only trigger this event when the drag is over?
One thing I already tried was binding to the Thumb.DragStarted and Thumb.DragCompleted events, and adding some flags to control the process, but these events aren't fired if the user clicks in the body of the slider, outside the thumb.
If you don't want to customize the control you can handle the KeyUp event and the PointerCaptureLost events instead of handling the ValueChanged event.
private void slider_PointerCaptureLost(object sender, PointerRoutedEventArgs e)
{
HandleSliderValueChange();
}
private void slider_KeyUp(object sender, KeyRoutedEventArgs e)
{
//Make sure an arrow key, Home, or End was pressed
//either explicitly perform the flag checks
//if(e.Key.HasFlag(VirtualKey.Up & VirtualKey.Down & VirtualKey.Left & VirtualKey.Right & VirtualKey.Home & VirtualKey.End))
//or check the int values
int keyVal = (int)e.Key;
if(keyVal >= 35 && keyVal <= 40)
HandleSliderValueChange();
}
private void HandleSliderValueChange()
{
//your value changed code
}
This should call the HandleSliderValueChange method when the user finishes dragging, clicks on the slider itself, or uses the arrow, Home, or End keys to change the value.
I am able to build custom rows with celltablebuilder. When clicking on a particular anchor cell, I am able to build additional subrows for that row. This subrow has buttons, when clicking on the button I have do some action. I am able to add buttons with clickhandler in the subrow, but when clicking on the button nothing is happening clickhandler is not firing.
Can anybody please help.
protected void buildRowImpl(GridDTO rowValue, int absRowIndex ) {
buildRows(rowValue, absRowIndex, true);
if (showingFriends.contains(rowValue.getComponentId())) {
buildAdditonalRows( absRowIndex, gridDTO);
}
}
private void buildAdditonalRows(int index, GridDTO rowValue, ){
TableRowBuilder row = startRow();
td = row.startTD();
if(rowValue.getXpath() != null){
//td.text(rowValue.getXpath());
renderCell(td, createContext(1), cellTable.getColumn(1), rowValue);
}else{
td.text("");
}
td.endTD();
td = row.startTD();
Button button = new Button ();
button.setText("Save");
button.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
Window.alert("ssss");
}
});
DivBuilder div = td.startDiv();
div.html(new afeHtmlBuilder().appendHtmlConstant(button.toString()).toSafeHtml());
div.end();
td.endTD();
row.endTR();
}
CellPreviewEvent provides subindex. You can use it to get subrow value.
Example usage :
dataGrid.addCellPreviewHandler(new CellPreviewEvent.Handler<TreeItem>() {
#Override
public void onCellPreview(final CellPreviewEvent<TreeItem> event) {
if(event.getNativeEvent().getType().equals(BrowserEvents.CLICK)){
if(event.getContext().getSubIndex()>0){
event.getValue().getChild(event.getContext().getSubIndex()-1);
}
}
}
});
Or you can provide custom CellPreviewEvent.Handler implementation with selectionMode. For more details you can look at AbstractHasData
I had a similar situation where i needed a widget inside a cell to listen for click events... What i found out is that the widget doesn't respond to events once you inserted it into a cell (In other words, only the actual HTML that makes up for the widget gets put into the cell, any kind of event handling isn't included). The work around is to add the events to the Cell (You can make a custom cell class for that particular cell-widget and override OnBrowserEvent to listen for events.)
See GWT: On adding custom widget to celltable losing events of the custom widgets for a more eloquent explanation and example code.
Looking at the signals in the QtWebKit API, I failed to find anything that would seem to me to be what I am looking for.
QWebView
linkClicked() seems to be the closest, but a reset button is no link, and definitely does not point to an URL.
QWebPage
I considered the following signals (judging by their name), but according to their description none of them match my purpose either: contentsChanged(), contentsChanged(), contentsChanged(), selectionChanged().
QWebFrame
None of its signals matches my purpose.
QWebElement
Here I can see how to get an object representing the button(s), but it has no signals whatsoever.
I want to catch a click in a reset button in order to store the data in the form before it gets cleared, so it can be restored later.
For now, I did manage to retrieve the buttons as a QWebElementCollection of QWebElement objects, and I can modify them, but I do not know how to get them to send a signal upon click, or something similar.
// Get reset buttons.
QWebElementCollection inputResets = mainFrame()->documentElement().findAll("input[type=reset]");
inputResets += mainFrame()->documentElement().findAll("button[type=reset]");
// Change their text (just a test).
foreach(QWebElement element, inputResets)
{
element.setPlainText("Worked!");
}
Well, I got it working with this, although I do not think it is the best approach:
bool EventFilter::eventFilter(QObject* object, QEvent* event)
{
if (event->type() == QEvent::MouseButtonRelease)
{
QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
if (mouseEvent->button() == Qt::LeftButton)
{
QWebView *view = dynamic_cast<QWebView*>(object);
QPoint pos = view->mapFromGlobal(mouseEvent->globalPos());
QWebFrame *frame = view->page()->frameAt(mouseEvent->pos());
if (frame != NULL)
{
// Get the existing reset buttons.
QWebElementCollection inputResets = frame->documentElement().findAll("input[type=reset]");
inputResets += frame->documentElement().findAll("button[type=reset]");
// Check if any of them is at the clicked position.
foreach(QWebElement element, inputResets)
{
if (element.geometry().contains(pos))
{
qDebug() << "Clicked element tag:" << element.localName();
return QObject::eventFilter(object, event);
}
}
}
}
}
return QObject::eventFilter(object, event);
}
You can probably accomplish this with Qt WebKit Bridge.
HI,
Am on creation of touch screen UI system.And am generating button for selecting products
Under certain category.
--> array of button creating dynamically And placing in TABPAGE when user selects Tab for category.
The button will be created with the name of products, Under the category selected.
{
'the way am creating controls.
mybutton(j) = new button()
mybutton(j).top = 100
}
How can i get the Click event of those buttons-( in the array)....??
You can use the += operator to assign a handler to an event, for example:
myButton.Click += ButtonClick;
and then declare it like this:
public void ButtonClick(object sender, EventArgs e)
{
// ...
}
Alternatively, if the code is short, you may like to specify it right there directly, for example:
myButton.Click += (sender, e) =>
{
// ...
}
The advantage of that latter method is that you can capture outside variables, such as for example the array of buttons and the index of this particular button.
Have a look at this link. http://forums.asp.net/p/1583639/3997438.aspx
Add button into the list and create a event for that.
In my editor, I have a composite containing a label control right at the top which flashes informative message in red colour whenever the user enters erroneous inputs in any of the below lying fields. The text keeps changing dynamically depending on user's input. I am able to achieve the effect of displaying red coloured text on erroneous inputs and displaying nothing in the label for correct inputs.
But, I want that when there is no error to display in the label composite, the rest of the below fields shift up in display. And when there is error to display, the error should appear in it's place(at the top of all other fields) pushing the other fields down.
Is there a way to achieve this effect without redrawing all the controls again?
Yes, call layout (true) on the parent.
For example I have a view that has a search bar at the top who's visibility can be toggled. I have a method to create the search composite and one to remove it:
private void createNameSearchBar () {
mySearchControl = new CardSearchControl (myViewComposite, SWT.NONE);
mySearchControl.setSearchListener (this);
}
private void disposeNameSearchBar () {
mySearchControl.dispose ();
mySearchControl = null;
}
private CardSearchControl mySearchControl = null;
private Composite myViewComposite;
private boolean mySearchBarState;
To hide or show the search bar control I call this method (myViewComposite is the top level control that owns the search bar and all the other contorls):
public void setSearchBarState (boolean show) {
mySearchBarState = show;
if (myViewComposite == null || myViewComposite.isDisposed ())
return; // no work to do
if (mySearchBarState && mySearchControl == null) {
createNameSearchBar ();
mySearchControl.moveAbove (null);
myViewComposite.layout (true);
} else if (!mySearchBarState && mySearchControl != null) {
disposeNameSearchBar ();
myViewComposite.layout (true);
}
}