Gtk::Widget on_enter_notify when mouse is down? - c++

I'm trying to have a list of Gtk::Widgets that when clicked on I need to highlight the widget, but when the user holds the button down, and drags to another widget, the first one will 'unhighlight' and the new one will highlight on enter_notify.
I've tried using the on_enter_notify_event, and on_button_press_event in multiple combinations ( yes, I'm adding the events ), but every time I 'press' the widget, it starts a drag event, and enter_notify and leave_notify won't fire.
Is there a way to ignore the drag event? I've tried ending it when it starts, but I think the problem is the on_notify won't trigger with the mouse down. Is there another way of doing it?
Any help or suggestions would be greatly appreciated.

Okay, apparently when a widget gets activated or clicked, the GdkDevice 'grab()'s the widget and only sends events to THAT widget. So I've taken the device from the event, and called 'ungrab()' on it so it allows the other cells to receive events. Then on my other cells I check the event->state in the on_enter_notify_event to see if the mouse is down, and voila! The cell is highlighted.
bool cell::on_button_press_event(GdkEventButton* event) {
highlight_cell();
gdk_device_ungrab(event->device, event->time);
return true;
}

Related

Wait cursor not getting dislpalyed in mfc?

I need a wait cursor to be loaded when the second page OnWizardNext of a property sheet is clicked .This is how I had done.Actually I designed a property sheet and now when I Click on the Next button I had activated the hourglass ,till this point everything works fine ,here arises the actual problem i.e,during that wait cursor period if I click again on Next button the dialog is getting dismissed .So,my intention is even if I click Next during the wait cursor it should not react to the click event.
LResult OnWizardNext()
{
CWaitCursor wait_cursor();
Sleep(10000);
return CPropertyPage::OnWizardNext()
}
if I remove Sleep then no wait cursor is getting loaded.What I need is even though if click on any button anything the event for that button should not get triggered until unless i am out of sleep time.
Can anyone please let me know how to achieve this.
I think you have a problem with the design of your wizard. You should not be using "Sleep" as it will suspend the thread. Moreover, the wait cursor is nothing more than a UI mechanism to indicate to the user that the code is still active. You seem to want to use that as a determinant for when your code can continue. Take a look at using OnSetCursor to provide visual feedback. Depending on what it is you're waiting on, you may want to look at using a timer, or, perhaps a series of "flags" to indicate a "continue" condition.

Detect click on a blank item in a list control

In my mfc dialog based application, there is a CListCtrl. I need to disable a button when the user clicks on an empty item in the list control.I used NM_CLICK message and achieved this. But if the user drags the mouse out of list control area and releases the mouse this doesn't work. I found the reason that NM_CLICK will be called only on receiving button up message.Is there any other solution for this.
But if the user drags the mouse out of list control area and releases the mouse this doesn't work.
That is entirely by design, and you shouldn't want those clicks to "count". This is the only way that a user has of changing her mind in the middle of a click. It works like this:
Start to click on an object (or the empty space) in the list box control
Change your mind
While still holding down the mouse button (i.e., before committing your click), drag the mouse pointer outside of the bounds of the control
Think: Whew! That was a close call!
You'll notice that, in Windows, an action never happens until the mouse button is released (often called "MouseUp"). If this wasn't supported, there would be no way for the user to bail out early of an action, which is a critical feature of any user interface.
There are some feasible options.
In parent dialog, MouseUp Handler function can use for this.
afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
By using point, you can check whether mouse releasing is occured CListCtrl.
If it is, you just disable the button.
Also, WindowFromPoint can be another option.
static CWnd* PASCAL WindowFromPoint(POINT point);
In such as a OnMouseMove, if you use this function, you can check the window is pointed by mouse.
Implement a LVN_ITEMCHANGED handler, and in that handler disable the button as soon as the selected item count is zero.
I found the solution for the issue. There is a message which can be handled if the user drags the mouse using left button namely LVN_BEGINDRAG.By handling this message in the OnBeginDrag function I update the button status.So the button gets updated as soon as the user tries to drag the mouse.The code is as below:
In the header add
afx_msg void OnBeginDrag( NMHDR* pNMHDR, LRESULT *pResult );
In the implementation add message map and corresponding function:
BEGIN_MESSAGE_MAP( .. )
ON_NOTIFY( LVN_BEGINDRAG, IDC_LIST1, OnBeginDrag )
END_MESSAGE_MAP
OnBeginDrag( .... )
{
Updatebutton();
}
It solves the issue. thank you all for the support.

OnLButtonDown() is not fired if I click an item in my dialog (ListBox, CheckBox etc) but it fires ok if I click background or Static Text

If I click anywhere on the dialog window, like in the "background", or on a Static Text, the function OnLButtonDown() is fired. But if I click a ListBox/EditBox/Combo/Calendar/Checkbox etc is not fired.
I thought that because these have control variables atached to it, and the Static Text don't. But adding a new Listbox to my Dialog and testing, I see that it doesn't fire either, so now I am confused...
I added OnLButtonDown() with the Class Wizard, it appears in:
BEGIN_MESSAGE_MAP(CMFCTesting2Dlg, CDialogEx)
ON_WM_SYSCOMMAND()
// other handlers, etc
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
END_MESSAGE_MAP()
My function:
void CMFCTesting2Dlg::OnLButtonDown(UINT nFlags, CPoint point)
{
AfxMessageBox(CString("BUTTON DOWN"));
CDialogEx::OnLButtonDown(nFlags, point);
}
I tried calling CDialogEx:: ... before AfxMessageBox... but same result.
The CListBox item, has the Notify option set to True, as I seen some advices in other posts.
I suspect that the WM notification message is captured somehow by the ListBox, and not sent "forward" to my CMFCTesting2Dlg, but I understood that this should happen with the Notify option set to True, on the ListBox, no? (well, obviously, not...)
Sorry, I am new to dealing with WM in MFC.
BTW, I use Visual Studio 2010 Ultimate, and this is a Visual C++ - MFC- MFC Application - Dialog Based project.
How can I capture this mouse down event if clicked on a listbox / combo / etc?
On the LONG STORY, I am actually trying to accomplish this issue:
I have two listboxes (lets say), and I want to scroll them synchronously, when user scrolls one of them, others must scroll the same (or update in the next moment). And I thought of using on mouse down to track the position of every Listbox (with the GetTopIndex), and on mouse up, to GetTopIndex again and compare with the previous ones. If a change was made, then a listbox was scrolled and then update all listboxes with SetTopIndex. The unfriendly solution for the user, but simpler for me, would be clicking a button that does this verification / update, but its not elegant at all, and it can only set them at the same level, but can't determine which one was scrolled last time. This automatically scrolling of the listboxes should be made just for displaying, it is not important the selections in the listboxes. I tried using the Message Type in the Add Event Handler for the Listbox, but none that are displayed work for my problem, KillFocus and SetFocus, are not fired if the scroll-bar is dragged, only if an item in the listbox is clicked... and I didn't succeed on the others message type either, from the Add Event Handler.
Once a window handles a message, it stops being sent to the other windows beneath it. A static window doesn't handle a mouse down, so it goes to the dialog. The other controls all handle it in some fashion (setting focus at least) so it never gets to the dialog.
You can override the OnLButtonDown handler in each of the controls to do something else once they've finished their default handling in the base class. You might also get to see the message in the PreTranslateMessage method of the dialog.
As far as getting the List Controls to sync scrolling goes, your best bet would be to intercept WM_VSCROLL by subclassing CListCtrl or perhaps by PreTranslateMessage, and then calling SetScrollInfo on the other list. If the number of items in the lists are the same, it should be fairly simple.

"?" help button triggers WM_HELP _and_ WM_LBUTTONUP

I have a Windows application that registers one CALLBACK procedure that handles WM_HELP messages for the dialog, and one CALLBACK procedure that handles WM_LBUTTONUP messages for a custom button.
Now, when the user clicks the "?" button, then clicks the custom button, the help opens up as expected (on mouse down), BUT if the help window is not occluding the button, a WM_LBUTTONUP message is triggered as well for the custom button (on mouse up). This causes the button to trigger when the user was only asking for help.
Is there any way to stop the WM_LBUTTONUP message from being sent if the button press is for help?
EDIT: The custom button is implemented using a STATIC control. I believe this is because it needs to have an image and no border. So, it does not send BN_CLICKED notifications. In fact, it does not seem to trigger WM_COMMAND in the parent at all.
Thanks
This is normal. Be sure to use the button's BN_CLICKED notification to see the difference. Generated when the user clicks the button, not generated when the user uses the help cursor. The button still sees the normal button up/down messages so that's not a good trigger to detect a click. Extra bonus is that the button can now also be clicked with the keyboard (space bar).
A good class library takes care of these nasty little details.
A better way would be to create ? as a custom control with BS_CHECKBOX | BS_PUSHLIKE style and capture the mouse. After that you will get all the WM_LBUTTONDOWN message to this custom control and then you can use WindowFromPoint to get the window where the WM_LBUTTONDOWN happened and can send a custom notification to the parent window. The parent window can then show a the tooltip or open the help doc or discard it.
The advantage is, you create the control only once and you can use it in multiple places.
Okay, I fixed it by creating the custom button (static control) with the SS_NOTIFY style, then handling the STN_CLICKED notification in the WM_COMMAND message. (SS_NOTIFY causes WM_COMMAND to trigger in the parent when it is clicked.) This does not trigger when using the "?" button. Thanks!

How to detect the mouse state in Qt without a MouseEvent

Okay, using Qt, I'd like to know how to detect the current state of the mouse at any point in time - without a MouseEvent.
Using QCursor::pos(), you can get its position, but is there a way to determine the current state of the buttons?
Basically, I'm looking to verify the state of the mouse when a timer goes off, so it won't be related to any particular MouseEvent, and so there's no MouseEvent to query. I need to know how to query for the mouse's state - in particular the state of the buttons - without having a MouseEvent.
Oh, and I'm using Qt 3, so if such a function has been added in Qt 4 but isn't in Qt 3, it doesn't help me much (though it would still be nice to know about).
Qt::MouseButtons QApplication::mouseButtons () [static]:
Returns the current state of the buttons on the mouse. The current
state is updated syncronously as the event queue is emptied of events
that will spontaneously change the mouse state (QEvent::MousePress and
QEvent::MouseRelease events).
It should be noted this may not reflect the actual buttons held on
theinput device at the time of calling but rather the mouse buttons as
last reported in one of the above events. If no mouse buttons are
being held Qt::NoButton is returned.
Edit: hmm, I just noticed you asked about Qt3.3. This answer applies to Qt4 I'm afraid.
Is it a hard requirement that you don't use MouseEvent? Or can you use MouseEvents indirectly?
If you create a boolean variable for every button and update it with mouse pressed / released events then you could just look at the values of the relevant booleans when the timer goes off.
Update for Qt5 (5.3.2):
if (QGuiApplication::mouseButtons() == Qt::LeftButton) { ... }
I am using a QApplication, but there is no mouseButtons() function there. You will need to include <QGuiApplication>