I'm developing a RCP application, where I need to assign shortcut (Alt+[key]) to SWT Button with image.
I'm able to assign shortcut to Button with text using "&" character,
fox ex: button.setText("&Select All"); then Alt+S will act as shortcut fot that button.
I have 2 questions regarding this:
How to assign Alt+[key] shortcut to SWT button with images (no text), without using key listener?
How to assign Alt+[key] shortcut to SWT button with text, but no shortcut key letter in that text, again without using key listener.
for ex: "UnFix" is the text on button and shortcut key should be Alt+Q.
I hope there should be a way to do this in SWT.
You can select a mnemonic by placing an ampersand before the letter that should serve as the mnemonic letter (like "&Select All").
If the control does not have a text or the desired letter does not occur in that text, you will ned to use key event listener. There is no way around that.
Some applications work around the 'missing letter' in that they place the mnemonic letter in brackes like this: "UnFix (&Q)". Though this technically work, I find this an esthetically rather unfortunate choice.
Using an unobvious mnemonic letter has also usability issues: how would a user ever know or memorize that Alt+Q means 'UnFix'?
After trying lots of work arounds, I'm finally able to assign shortcut key to SWT button with image.
SWT Button.class make use of getText() method to find mnemonic, so overring getText() method of Button.class and returing mnemonic key will serve the purpose. checkSubclass() method should also be overridden to do nothing otherwise swt's Subclassing not allowed error will occure.
Button newButton = new Button(parent, SWT.PUSH){
#Override
public String getText() {
return "&N";
}
#Override
protected void checkSubclass() {
// Do Nothing to avoid Subclassing Not Allowed error.
}
};
newButton.setImage(newButtonImage);
I above example newButton has the shortcut key Alt+N.
Related
I develop a package, which allows user to use Home button to toggle cursor position in soft-wrapped lines, as it is in Komodo Edit editor.
In my toggle() function I try to get active text editor from Atom Workspace using getActiveTextEditor function and then I do my logic.
atom.workspace.getActiveTextEditor()
I bind a Home key with a selector atom-text-editor.editor, and it mainly works fine until triggered inside Search&Replace pane or Command Palette.
"atom-text-editor.editor": {
"home": "toggle-home:toggle"
}
In this case, getActiveTextEditor returns always a currently edited file's text editor. It leads to a situation, when a cursor is moved inside an edited file's pane, but not inside focused field. When I use a Home inside a text field in Settings pane, Atom throws an exception, as it can't find any active text editor.
I did a research through Atom Docs, Atom API, even community packages, but all I found, was adding 'mini' to my event selector, to narrow event scope a bit.
"atom-text-editor.editor:not([mini])": {
"home": "toggle-home:toggle"
}
Nevertheless it still causes exception or misbehaviour in text fields without 'mini' (ie. textarea of Git/GitHub package).
What I want to achieve is:
1) to find a proper keybinding selector, that would fire only inside currently edited file pane;
OR
2) to find a method to get focused instance (Search&Replace, Command Palette or any other field) for further processing.
Solution
As DamnedScholar mentioned here:
the selector atom-workspace-axis.vertical atom-pane-container atom-text-editor:not([mini]) will do it.
Already tested, works fine.
I have a QLineEdit, on which I have set a QRegExpValidator, that allows the user to input only one whitespace between words.
Now I want that whenever the user tries to enter more than one whitespaces, the tooltip of the QLineEdit should show up, but I'm not getting any method to implement it.
Thanx :)
It seems there is no direct method to perform what you want. One way to do above is to handle QLineEdit's textChanged() signal. Then you can check that string against your regular expression using QRegExp::exactMatch() function and if it don't match then show tooltip.
Connect the signal..
...
connect(ui->lineEdit,SIGNAL(textChanged(QString)),this,SLOT(onTextChanged(QString)));
...
Here your slot goes..
void MainWindow::onTextChanged(QString text)
{
QRegExp regExp;
regExp.setPattern("[^0-9]*"); // For example I have taken simpler regex..
if(regExp.exactMatch(text))
{
m_correctText = text; // Correct text so far..
QToolTip::hideText();
}
else
{
QPoint point = QPoint(geometry().left() + ui->lineEdit->geometry().left(),
geometry().top() + ui->lineEdit->geometry().bottom());
ui->lineEdit->setText(m_correctText); // Reset previous text..
QToolTip::showText(point,"Cannot enter number..");
}
}
I don't remember explicit API for showing a tooltip. I'm afraid you'll have to go with popping up a custom tool window (i.e. a parent-less QWidget) to achieve the desired result.
If you want to style your own popup window like a standard tooltip, QStyle should have something for that. If in doubt, read into the Qt source code where it renders the tooltip. That'll tell you which style elements to use.
If I have a button in my View named, say, Save, then I can add a Save property to my ViewModel, and Caliburn.Micro will automatically bind it to my button's Content. For example:
public string Save { get { return StringResources.Save; } }
Or I can add a Save method to my ViewModel, and Caliburn.Micro will execute that method when the button is clicked. For example:
public void Save() {
Document.Save();
}
But what if I want to do both? C# doesn't let me declare a method and a property with the same name. Can I use conventions to both set the button's Content and the action to perform when it's clicked?
(I know I can manually bind one or the other, but I'd rather use conventions if it's practical.)
This is a common need, so you'd think it would be built into Caliburn.Micro, but it doesn't seem to be. I've seen some code that extends the conventions to support this (and I'll post it as an answer if nothing better comes along), but it's a workaround with some bizarre quirks -- so I'd like to hear if anyone else has made this work more cleanly.
Note: I did see this similar question, but it seems to be about whether this is a good idea or not; I'm asking about the mechanics. (I'll reserve judgment on whether it's a good idea until I've seen the mechanics. (grin))
Quick and dirty
<Button x:Name="Save"><TextBlock x:Name="SaveText"></TextBlock></Button>
we have a C++ application that hosts a flex application in a MFC dialog. Everything works fine, all button pushes etc are passed directly on to flex with no problem at all, except the enter and escape keys, which immediately closes the dialog.
We can trap the enter key, by implementing PreTranslateMessage() or OnOK()
and impede the window closing behavior, but we still have the problem of passing these enter key pushes on to the hosted flex app further.
There is no "default" button on the form or anything like that, perhaps MFC is linking the enter key to the close button in the title bar behind the scenes or something.
Does anyone have any ideas how we can stop MFC from treating the enter key from being a special case.
Thanks a lot for any hints.
Edit: Here is PreTranslateMessage() that mmonem requested.
BOOL CFlexDialog::PreTranslateMessage(MSG* pMsg)
{
if ((pMsg->message == WM_KEYDOWN))
{
if (pMsg->wParam == VK_RETURN)
{
m_ctrlFlex->OnReturnKeyPressed();
return TRUE;
}
}
return __super::PreTranslateMessage(pMsg);
}
But it is not a suitable solution, calling a method in the flex app like that, as it makes life too difficult for the flex developer, it means he must write a special version implementing the return key behavior for every control.
We just want MFC to treat the return and escape keys like every other key.
Remove OnOK() and OnCancel(); PreTransateMessage is enough after considering VK_ESCAPE.
Why don't you use:
m_ctrlFlex->SendMessage(WM_KEYDOWN, VK_RETURN, 0)
instead of
m_ctrlFlex->OnReturnKeyPressed();
in your implementation of PreTranslateMessage ?
MFC command buttons can respond to events even if they do not have the focus.
Have you tried trapping the OnClicked event and OnOk to return nothing?
Example: trap OnClick...
void CMyDialog::OnClickedMyOK()
{
CDialog::OnOK();
}
Then do a no-op in the OnOk()
void CMyDialog::OnOK()
{
}
This should stop the enter key from being processed.
Another approach is "Windows Subclassing." That is, sending messages from one Window Procedure, that is a WindProc() to another WndProc(). This may provide a way without direct intervention. (This is not C++ subclassing.)
Here's a way with MFC Subclassing Edit: Provided a better link.
Search for "Windows / MFC Subclassing" if more info needed.
The flex control/window has a WndProc and your window certainly has a WndProc, Windows Subclassing should work.
New Edit: Here is perhaps a better link for subclassing an ActiveX control.
ActiveX Controls: Subclassing a Windows Control
Subclassing Windows Forms Controls - More .Net-centric.
Notice: In MFC you should see these functions.
CWnd::SubclassDlgItem
CWnd::SubclassWindow
CDialog inherits from CWnd so you will see those two functions as "dialog" functions as well. They are key to making this work. If the flash window is a true window, use SubclassWindow. If it's a control use SubclassDlgItem.
And finally, if nothing else works. A product/library that will hopefully make it easy. EasyHook looks like a product here. EasyHook at CodeProject, you can get all the source code.
If you are having issues handling tabs & enter keys I would recommend you look into using a window instead of a dialog. The dialog adds modal ( if you are using modal ), tabbing & default button handling. If you don't need/want those features, or if they are getting in your way, then don't use a dialog.
If I understand what you are doing, then you want flex to handle tabbing, enter key, and all sorts of other messages. Get the dialog code out of the way. If you still want modal style, then you may have to handle the enable/disabling of parent windows - thats all that windows does when you open a modal dialog.
Flex 3 question:
I trying here to avoid having to bind resources to all my components labels ( ie a button) and find a way to have this automated.
Problem:
It corrupts the layout in design mode to bind directly in the mxml label="{resourceManager.getString('myResources', 'submit')}" and makes the design view useless. but when declaring bindings elsewhere, in actionScript or via a bind tag, it is counter productive and prone to many errors and miss.
Proposition:
I would like to create my own button that automatically invoke resources to localize a button label. So the author puts "Submit" in the mxml description of my button, and when running it would take the value of the label ie "submit" and use resourceManager.getString('myResources', 'submit').
but I can't find the way to override the set label function, Is it possible if yes how? else how can I go about it?
Maybe I am missing an essential process here that would make the use of resources more elegant, as well as how to override such thing as a button's label.
Thanks for your advices.
Create a component called MyButton, extending Button. Then use this:
override public function set label(value:String):void {
super.label = resourceManager.getString('myResources', value) || value;
}
Assuming the resource manager returns "null" or "undefined" this will work, and will only replace the value if it exists in "myResources".
If you don't want to override every component you need to do this with, then you can add a FlexEvent.CREATION_COMPLETE event on every component. Then use a single generic function to do your label localization.