I have created a List view control with View = Icon / List, with LVS_EX_CHECKBOXES enabled.
And the checkboxes overlap with the items text, so I am wondering how could I create a owner drawn list view with checkboxes ?
I have seen that one has to process LVN_ITEMCHANGED notitication to test if an item has been checked.
How does this apply when the checkbox itself gets owner drawn, how do I approach this problem.
How Do I manage the events, the checkbox checking and unchecking while drawing my own, do I have to implement the checking routines myself or do I get something from the window? A message or something? While drawing my own checkbox how do I differentiate between a click on the item and a click on the checkbox, do I have to check the coordinates of the cursor when the click occured? how do I do this.
THis is with view= icon, it shows ok with view=list
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I have a listbox in which multiple list items are there. I want to implement something like if we click on the list item, it will collapse and show the summary of the clicked item:
I have been searching this on the web for quite sometime but haven't got any good solution. I am very new to Win32. Any suggestions on how to approach this like which control should I use. Any help will be appreciated.
Standard ListBox and ListView controls do not natively support expanding/collapsing items, however it is possible to implement it in a ListBox with some extra work.
Give the ListBox the LBS_OWNERDRAWVARIABLE list box style to allow the list to contain items of different heights. When a new item is added to the list, the ListBox will send a WM_MEASUREITEM message to its parent window asking for the item's initial height. Return an appropriate height based on whether the item should be displayed as collapsed or expanded.
Once an item has been added to the list, you can send the ListBox a LB_SETITEMHEIGHT message to assign a new height for that item based on whether it should now be displayed collapsed or expanded. Then invalidate the ListBox to trigger a repaint of the items.
The LBS_OWNERDRAW... styles require you to manually draw each list item whenever the ListBox sends a WM_DRAWITEM message to its parent window. You can draw the requested item on the provided HDC however you want, such as with the DrawText() function, configuring its parameters based on whether the item's text is currently being displayed as collapsed or expanded. Also use the state information provided by the message itself to configure the HDC's font and background/foreground colors as desired (particularly important when rendering items in the selected and focused states).
With that in place, all you have left to do is make your click handler determine the index of the item being clicked on (via GetMessagePos(), ScreenToClient(), and LB_ITEMFROMPOINT), and then assign it a new height based on its new expanded/collapsed state, and let the resulting repaint draw the new text accordingly.
I've designed a toolbox control. It's inside a CDockablePane object. Since the tools inside it may need to be scrolled, I've created a CScrollView as a child of the pane and have inserted the tools inside it as children. Based on the pane size, scrollbars of the CScrollView object appear properly, but clicking on them doesn't scroll the view. It seems that they're disabled. When I use SS_NOTIFY style when creating the CScrollView, the CScrollView object receives mouse clicks, but when i don't use the style, it doesn't. But it seems that the scroll bars inside the view control don't receive clicks. When mouse hover over them, no visual effect in scroll bars appears. It seems that the scroll bars are disabled, while I've not created nor manipulate them.
What's wrong?
mouse wheel works. click on scrollbars is received by the scroll view, not by the scrollbars. inside handler, i wrote this code:
CScrollBar *pScroll = GetScrollBarCtrl(SB_VERT);
if (pScroll->GetSafeHwnd())
{
...
if is not true. this means that the scroll view has not a scroll bar, but if so, how is it shown?!
any idea?
...
since i didn't get answer, i'm going to clarify my question with a sample code:
https://dl.dropboxusercontent.com/u/4829119/930501%20-%20t3.zip
in this sample, how can i scroll my view as i do with other views like class view and file view?
the sample code screenshot:
https://www.dropbox.com/s/7pu5chpyj9hqeal/Screenshot%202014-07-23%2003.40.26.png
Did you initialize by calling SetScrollSizes? The scroll bars are enabled only when the sizeTotal is larger than the view window size.
I have a CTreeListCtrl in my MFC application.What I need to do is add a button in a particular column of a node when a particular condition is satisfied(type is changed to reference).
In the image I have edited and added a blue rounded oval to mark the place of desired button.What I want to do is to invoke a dialog on clicking it.But I don't have any clue whether it is possible or not.If yes then pls give me some suggesions.
This is no normal tree control. It is already customized to use multiple columns and I am sure it uses some kid of owner draw. For me it seams more like a list control with tree Features... I know some similar code from Codepproject..
Creating a "real" button (window) isn't wise/good. because it is another window inside the list control...
Change your code to "Draw a button. You can use DrawFrameControl.
Just intercept the left mouse click. Check the range if this area is cliecked. Fire a user defined message to the parent window.
I'm trying to create a popup menu like control that contains custom widgets. I need to capture the mouse, but I need to have the children in the widget still get their mouse messages. It appears the grabMouse sends events only to the widget that grabbed the mouse, not its children.
The popup is simply a series of buttons (using a QGridLayout). The control should work that the user presses the right-mouse button, the popup appears, they move to an item and release the mouse button. Optimally it would work exactly like a QMenu popup but with custom widgets and a custom layout.
How can I achieve this?
It appears that simply specifying attribute Qt::Popup is enough to get the fundamental behaviour required.
Installing an event filter on all children is also necessary. All mouse events, enter/leave/hover events must be captured. QT has a defect with grabMouse so that won't work -- the filter must be used to get expected behaviour.
I've got an app that uses several CView-derived classes (actually CScrollView) to display document data. For one particular view, I want to add a fly-out edit box to add notes. That is, you'd see a tab at the bottom of the window labeled "Page Notes", and clicking on that would bring up the edit box. Clicking the tab while the edit box is visible would reduce it back to just the tab.
I thought I could use a one-tab CTabCtrl holding an edit box and just position it so that only the tab is visible initially. Capture the tab click notification and move the entire control, with edit box, into view. Clicking the tab again would move it back down so only the tab is visible.
Hosting the CTabCtrl on the CView is fine, and I can get it positioned correctly. The problem is that if the view is scrolled, the tab control is scrolled along with it, whereas I need it to "float" over the view and not be affected by any scrolling. I can move it back into place after the scroll, but the flickering is unsightly.
Is there a straightforward way to accomplish the "floating" effect? I mainly want the tab embedded in the view for maintenance, since it's the only view class out of the several in use that needs the "Page Notes" feature.
Should I just buckle down and put the tab in the view's parent window instead? I know it won't be affected by scrolling there, but I like the idea of keeping the tab as part of the view if possible.
It sound like the tab is functioning like a button. You click the tab and a fly out edit box appears. You could use a modeless dialog.
Select the "Page Note" and the modeless dialog comes up to edit your notes allowing you to scroll your view under the dialog.