I am quite new to MFC. I am currently using the CrectTracker class of MFC to draw a selection rectangle to select an area on a graphic in MFC based application. However, I would like to do the selection using mouse clicks instead of L button press and drag and release action.
Can somebody point me to an example where the crectracker class can be used to select an area using mouse clicks, first click to start the selection and second to end? Or do I have to implement my own OnLButtonUp actions for this?
Thanks.
You need to implement the MouseMove event.
http://msdn.microsoft.com/en-us/library/3158baat%28v=vs.80%29.aspx
This functions gives you 2 Parameters.
Flag : Here you can check the Left Mouse Button is Clicked
Point : Position of the Mouse cursor.
Related
Is there any way to capture which keyboard key is pressed or which mouse button is clicked in "On Click" event of a shape? In an agent based sample, I need two different actions when user clicks on a specific shape in two different occasions. How can I handle it?
Thanks in advance
Is there any way to capture which keyboard key is pressed or which mouse button is clicked in "On Click" event of a shape?
No, there is no way to do that built-in to AnyLogic: you must left-click all controls and there is no 'press a key' type construct in AnyLogic which would allow you to intercept any key press.
If you want multiple possible user actions, why not just have multiple buttons or, say, a Combo Box and Button?
If you want the button to do different things dependent on the current state of the model you would do that by relevant conditional code (e.g., via Java if statements) in the Button's action (and you could make the label text of the button dynamic so that the label refers to what the button will do if pressed now, which requires some Java to code the logic for the dynamic value).
What is your actual design requirement?
In short: If any mouse button is Pressed when the mouse enters a WPF window, all mouse events are ignored regardless of whether the mouse is captured by any process.
The Challenge
Create two WPF 4.5 projects. In the first one, add a Border with a MouseDown handler. Inside that handler, do everything you can think of to release mouse capture:
this.ReleaseMouseCapture();
element.ReleaseMouseCapture(); // "sender"
Mouse.Capture(null);
while (Mouse.Captured != null)
Mouse.Captured.ReleaseMouseCapture();
ReleaseCapture(); //Win32.ReleaseCapture()
In the other project, add a MouseEnter handler to the default grid that will change its Background.
Start them both up, MouseDown on the border and "drag" to the other window. Until you release the mouse button, the second Window's background will not change.
What's really annoying is that if you stay within the first window, the attempts to "uncapture" the mouse appear to work. Add another element in the first window with a MouseEnter handler, and it will fire just fine. This implies that WPF doesn't know or care about cross-process capture. It just ignores events if any mouse button is in the Pressed state when the mouse first enters an application.
Anyone know if it's possible to have WPF elements respond to mouse events when the mouse was pressed before entering them?
I'm developing a schematic editor, i need to hide the cursor when the middle key is down and moving, and show it again when the mouse up event occurs to implement an user friendly zooming system. The hide and show methods works fine when they are called from outside these event handlers, bud does not work when then called within the event handler!
I wish to make a drag and select application in GWT where I wish to have cell table or grid of say 20*100 columns*rows. I want to add a event such that I can drag something like a rectangle with my mouse and all the cells in that region get selected or I can fire an event for each cell and assign each of them a same ID. The main idea behind the thing is to perform a selection by dragging and then grouping all selected cells as one, something like Excel sheet selection. Can any one help me out in this?
I have once implemented GWT widget allowing to "select" some rectangular region of a table. Basically the idea was to subclass a Grid or FlexTable and do all the logic in various mouse event handlers (mouse down, mouse up, mouse out, mouse over).
The only minor hack I had to introduce was a method for getting the cell for any mouse event. There is a method HTMLTable#getCellForEvent that works for a click event, but when I looked into implementation of this method, I saw that it could actually work for any event, so I just implemented my own method for getting cell for any mouse event based on mentioned implementation.
Maybe it would be also possible to achieve this using HTMLTable#getEventTargetCell
Ok so could anyone please help me out with the VB for auto entering information into a text box, by clicking certian label boxes on a form in access 2003.
I built this thing using label boxes as "sort of links" instead of button for navigation/commands etc, and I have this power point presentation viewer on one of the forms.
The client has numerous briefings and this will be great for me to provide a little something for them to be able to get their briefings from one spot.
So if I list the choices for the month out on the form as label boxes (with little mouse move events to resemble a web link) and they click on it to select, then the only way I know how this may become functional is if I add a text box to the form, and make it not visible, that way I can name it, and add it to the file path string and it works.
But how do I create the action of clicking the "link" result in "NVOWEFDJHF" into text box?
Anyone know a better way?
Yeah I am an amateur, so I am ALWAYS willing to learn a better way.
Thanks very much!
I would recommend using a transparent button instead of a label.
The main reason is that you can set the mouse cursor to become a small hand when you hover over the button, so it gives back information to the user that this can be clicked.
With a label, the user cannot make the difference between a normal label and one that can be clicked since there is no visual cue.
To create a button that resemble a label:
Add the button to the form
In the properties for the button, set the following:
Format > Back-Style: Transparent
Other > Cursor on Hover: Hyperlink Hand
Other > Name: btAutoFill (or whatever name you want)
If you want the button to resemble a link a bit more, you can change it's caption's format, making it blue and underlined if you wish.
Now if you view the form, you will see that the mouse cursor will change when you move over the 'button label'.
To automatically fill-in other controls when you click your button, add the code to handle its OnClick event (in the button's properties, under Events > On Click, choose [Event Procedure]):
Public Sub btAutoFill_Click()
myTextBox = "NVOWEFDJHF"
End Sub
Quick air code here...
Private Sub MyLabel_OnClick()
Me.MyTextBox = "NVOWEGDJHF"
End Sub
Don't forget your error handling.
You're making this as difficult as possible by using an approach that is not Access-native. The simplest way to make the labels "clickable" is to put a transparent command button over them. But that means the MouseMove events will go to the command button, so you'll have to have its events do the MouseOver actions.