After looking at the documentation, I'm able to persist state in the following two cases:
When a WebviewPanel is hidden (ie, the user switches tabs) using getState/setState
When the user restarts the VS Code by implementing a WebviewPanelSerializer
However, I don't see a way to persist state when the panel is destroyed (ie, the user closes it or calls dispose). Here's my scenario:
I execute a command to show the WebviewPanel
I have an input box in the HTML content. I type some string in and press a button to save it. Upon saving, I save it using setState and then append a div with the entered text into the webview.
I close the panel and execute the command again. The panel does not have the appended div.
You have 2 options:
Recreate the additional div when you find saved state (e.g. the input from the user).
Use retainContextWhenHidden to keep the content of the webview, even if it is moved to the background.
The latter won't help when the user closed the webview, however, and is much more resource hungry than the state save/restore operation.
Related
I have a TEdit in a Delphi VCL form app (contained in a TFrame instance, if it matters). After a user indicates they are finished editing, by clicking elsewhere on the form, the caret and focus remain on this control until I click on another control, which then takes the focus. However, I want the TEdit to loose focus regardless of where the user clicks. I expect I can use ActiveControl := nil to end focus on the selected control, but I am uncertain where to invoke it.
What I want is for the focus to leave the selected control without necessarily having to transfer it to another control. I could end focus in the form's OnClick event, but that will not work if the user selects any of the other controls (also contained in frames) on my form, since the form's OnClick event is not triggered. It seems inelegant and tedious to provide separate OnClick events for each additional item on the form.
What is the global solution to achieve this behavior?
Try using the TApplication(Events).OnMessage event to look for WM_LBUTTONDOWN messages.
You can use the VCL's FindVCLWindow() or FindDragTarget() function (both in the Vcl.Controls unit) to see if there is a TWinControl located at the click coordinates. Or simpler, you can use the VCL's FindControl() function (also in the Vcl.Controls unit) to get an TWinControl directly from the message's target HWND.
If no control exists under the mouse, or if the control is not focusable (its CanFocus() method returns False), then set ActiveControl=nil. Otherwise, do nothing, and let the clicked control take focus on its own when the message is processed.
I have this task as a homework for interview - to test the webpage of popular site. Got a pop up form with some text in the fields. The task is to check is there are fields has been changed.
The page constructed that way, doesent matter if the data changed, popup window just closed with no additional text about it. I have no idea how to deal with it. Is there any commands in selenium checking, if the form has been sent?
add1
This is a PopUp changing profile window. It is shown below with my translations as the red font.
It is obvious, when this window opens, some values are already in the textfields (that is ur name/surname that u've entered before).
When u press the save button, this page checks if the data been changed since this window been opened (did u really changed anything).
The html code of "save" button has been shown on the pic2. U can see javaScript listener on the save button. There are somewhere must be a JS code, that checks if the data been changed and sends the form, and canceling the form sending, if there's no changing.
My Goal is to check using selenium, if the form has been sent.
I have a big form on extjs which opens in window, and, for speed reasons, i cache it in hidden panel. There is can be only one window at time, so the cached form is single too. On show event i add form to window, with no rendering and with suspendLayout option for form. On close event i move the form to hidden panel, with panels add method. I do not use remove method not for window not for panel. So, for several times all perfect, but after 3- 5 window openings form lose all of its events: buttons, comboboxes, triggers and other controls are not responding. Where is the problem? Thank you.
It is difficult to know for certain but my theory is that the observable object that your listeners are setup on is garbage collected at some indeterminate time period of inactivity.
I have seen this occur on an object representing the body of an iframe that is watched from the parent window. Click events from the body will work for some time and then all events will stop.
One way to test the theory is to store object reference in a global variable - this is NOT what you want to do in any app but worth a try just to test. Global vars are never garbage collected.
I'm trying to build a Wizard framework in Windows Forms. I've managed to glean a lot of useful tips from this and other sites which have gotten me very close to success. However, I'm having a problem with displaying an ErrorProvider on any tab page other than the first page of the wizard.
My Wizard control is a UserControl. It contains a custom tab control that I've derived from TabControl so that I can hide tabs and ignore attempts to navigate between tabs using keypresses, along with the usual collection of Back/Next/Finish/Cancel buttons at the bottom of the control.
I've used reflection to allow me to raise the validation events on a particular TabPage that belongs to the Wizard Control when I hit the Next button. (I don't want to validate the whole TabControl, only the currently active page.) When I do this, I see in the debugger that my Validating routine for the controls on the current tab page is correctly called and I see that I've called the ErrorProvider that I've attached to the particular control (a TextBox in this case) with a valid error message. I set Cancel to true for the CancelEventArgs in the validating routine and that's picked up by the code that uses the reflection mechanism so that I see that I've failed and don't change tabs. And I set the focus successfully to the control that failed validation.
So all that appears to be working just fine.
Unfortunately, I don't see the ErrorProvider's cheery blinking icon unless I'm on the first tab page. For all of the other tab pages, there's no message visible at all.
I'm baffled. Any thoughts? I can provide code snippets, if helpful.
Thanks!
I assume that in your case the button that moves to the next step of the wizard is placed outside (below) the TabControl
I noticed that the icon is displayed correctly if I pressed the button without releasing the mouse button. It seems that the button outside the container gets focused event though a validation error has occurred (normally you would not be able to leave the active control).
I worked around this issue by registering an event handler for the buttons MouseUp event to "refocus" the TabControl:
private void cmdOK_MouseUp(object sender, MouseEventArgs e)
{
tabControl1.Focus();
}
Note: you also need to set your forms ActiveControl property the one of the controls that failed validation.
I want to know if there is any way to navigate Dialog components by pressing the Enter Key in the same manner natively implemented by the TAB key?
Though I haven't tried it by handling the keyDown and keyUp events certainly it seems doable. Though you may not be able to intercept the browser produced dialog boxes this way and other dialogs created using Window.alert(). How are you creating the dialogs ?
The tab key is the browser doing the work of changing focus - nothing special needs to be added, you'll find that tab works on any form on the internet (except where explicitly disabled for some reason...).
To move focus with the enter key, you must listen for the onkeydown event (focus change via tab also occurs onkeydown, so selecting this for consistency), check if it was the enter key, and if so, move focus to the next element in the list.
Typical tab focus behavior involves the browser checking the tabIndex of the elements on the page, and finding the next element on the page with a higher tabIndex, or the nearest subsequent sibling/cousin element. I don't have a method to implement this easily, so instead I'm going to focus on just going to the next widget.
GXT 3's FormPanelHelper has some handy methods to look for all Fields - this code could be used as a basis for non-GXT fields as well. Track all FocusEvent and BlurEvent from the fields found in the dialog, and use that to always track the currently focused field. Add a key handler to the dialog itself, to capture all key events, and check if one is the enter key. If so, figure out what the next field is from the currently focused field, and invoke .focus() on it - this will trigger the focus handler described above, so your bookkeeping will be updated correctly.
And as #eliran-m noted, consider leaving the tab key alone - don't get in the way of users navigating the way they are used to. Adding new functionality might be a good thing, but taking away expected behavior probably isn't.