I plan on using a scrollbar for, well, scrolling an image. The image is 200x500, however, the only visible area is 200x250.
So I set the max value to 250, and the min value to 0. The idea is that if I drag the scrollbar's button to the bottom, 250 pixels will have moved for the image, right?
But wait, the scrollbar's button is.... very small. And the scrollbar is actually pretty long. Is there a way to make the scrollbar's button longer?
How did you create this scrollbar? Is it a separate control all together, or it is a component of another control? I do know that scrollbars added separately act kinda funny at times.
What I would suggest is using the scollbars built into another container control, which should achieve the exact same effect.
Create a new panel control on your form, and name it. (I suggest something like panelPicture)
Position the panel where you want your picture to be.
Set the panel's size to 200x250.
Set the panel's "Autoscroll" property to True.
Put a PictureBox inside this panel, and name it. (I suggest something like picMyPicture.)
Set the PictureBox's position to 0, 0.
Set the PictureBox's size to 200x500 (or whatever is necessary).
Set the PictureBox's Image property as desired.
Now, the scrollbar should automatically appear on the picture, and it should look normal.
As a side note (which may or may not be relevant), users typically don't like having to scroll to see the rest of an image, so if you don't need the user to scroll down on the image for some definitive purpose (or because you don't know what the size of the image that will be handled is), I'd try and change the size of things on your form so scrolling will not be necessary.
I hope this helps!
Related
How to open the ContextMenuStrip programmatically at the cursor on right mouse button down/clicked over PictureBox?
I need to open ContextMenuStrip only in some areas of an Image (Schedule) in a PictureBox, so I disconnected the PictureBox.ContextMenuStrip property from the ContextMenuStrip1 and I'm firing it manually. That means I need to provide a point, which appears to be surprisingly challanging.
My question is similar to "How to get location of ContextMenuStrip", but I need to account for both vertical and horizontal scrolling, which it doesn't (unless I messed something).
So when I'm trying something like this (in PictureBoxPlan.MouseDown):
Dim rpt As Point = Me.PointToClient(PictureBoxPlan.Parent.PointToScreen(e.Location))
...it has a fundamental flaw, because the e.Location is in context of Image, regardless how it is scrolled within the PictureBox. I tried to Form.MouseDown event, but it's not fired, when [right] clicked on a PictureBox.
Just for confirmation, I still need the point in PictureBox context to analyze whether the ContextMenuStrip should be shown or not and to lookup associated ID.
I am now trying to use some constants (may not work if windows "font size" is set to other than 100%) together with scroll bars values, which is not optimal at all.
OK, I found what is breaking the logic in the ContextMenuStrip.Show(Point) documentation:
Show(Point)
Positions the `ToolStripDropDown` relative to the specified screen location.
So the ContextMenuStrip, to my surprise, takes the screen coordinates, not the Form ones. I then just removed PointToClient and everything works as a charm, regardless of window position on the screen or scrollbars position of the Image container:
Dim rpt As Point = PictureBoxPlan.PointToScreen(New Point(e.Location.X, e.Location.Y))
No need to take into account PanelPlan.VerticalScroll.Value or PanelPlan.HorizontalScroll.Value.
I'm working on a GTK program in Rust (someone can probably answer this if they don't know Rust, as I can figure out how to translate between different bindings and the native C API) via the gtk-rs bindings for which I want to have a non-editable TextView who's contents are constantly updated in my code. I want the user to be able to resize the TextView to any size, after which my code will re-calculate its contents accordingly. Unfortunately, GTK prevents any resize from taking place that would hide any contents that are current in the TextView. I can't use a ScrolledWindow because I don't want visible scrollbars, and disabling the scrollbars on a ScrolledWindow prevents the resizing behavior that I want. I also tried calling set_size_request to set the size to both 1, 1, and 0, 0 after every text change, but this does not change the behavior at all either — the user still can't properly resize the TextView (by resizing the window).
How can I enable the resizing behavior that I want?
Probably this is not possible. What would be the point of resizing the text view smaller, if the user can never see the text that is outside of the viewport because you don't want scrollbars? That seems like it would confound the user's expectation of how such a component would usually work.
Maybe an approach could be that you pick a certain number of lines to show, make that the size of the viewport, and delete the old contents of the text view that scroll outside of the viewport?
I have a UIButton which is created programmatically (it can be customised from Interface Builder, though). It is a circular and it looks like this:
Now I'm working on Internationalization and I need to check it for Double-Length Pseudolanguage. The image above is taken when the app language is set to double-length pseudo, but as you can see, the button only shows one word. Here are the constraints of the button:
The title style of the button is plain, its text is centre-aligned, and the line break is set to "Word Wrap".
How to make the button keep its shape but to increase its size when needed (basically, to increase its width and height for the same amount, so it keeps being a circle), so for example, in this case to show two "Menu" words? If you know how to achieve this I would appreciate your help.
Try setting the content compression resistance on the button to required (1000) for horizontal and vertical. It will also depend on the stackViews above and below allowing for the size change.
I have designed a form in VB.NET. At design time I have placed two buttons on it.
When I run it, the form size looks smaller and the buttons I have placed at the bottom are not visible. Also the alignment of the text and picture box is also different from what I set at design time.
Computer at which I am running the form is using a different resolution.
change the properties (F4) of the buttons: in ANCHOR put Bottom, Right
your buttons will be tied to the bottom and the right of the screen, instead of to the top, left, which is the default.
Grab the screen size at runtime with
Dim screen as System.Windows.Forms.Screen = System.Windows.Forms.Screen.PrimaryScreen
and using a scale factor depending on the current size (in design), scale the window to match. Check the coordinates of the buttons by hand to make sure they are not outside of the visible portion of the window.
You may not have to leave this feature in if you can debug it to the point that you know the exact resolution that you need.
Sometimes, I have a picturebox lets say 100x100. But the image it will display is actually 100x400.
I don't want to increase the size of the picturebox itself. Instead, I would like to create a vertical scrollbar (or horizontal if needed).
I could not find a scrollbar in the toolbox, so I guess I have to code it. But, how?
And I still wonder if I didn't make a mistake and didn't see the scrollbar in the toolbox. My apologies then :(
I suppose you could add separate scrollbar controls and sync their Scroll events up with the offset at which the picture in the PictureBox is drawn, but that sounds like actual work. There's a better way.
Add a Panel control to your form, and set its AutoScroll property to "True". This will cause the control to automatically show scrollbars when it contains content that lies outside of its currently visible bounds. The .NET Framework will take care of everything for you under the covers, without you having to write a single line of code.
Drag and drop your PictureBox control inside of the Panel control that you just added. The Panel control will then detect that one of its child controls is larger than its visible area and show scrollbars, thanks to the AutoScroll property. When the user moves the scrollbars, the portion of the image in your PictureBox that is visible will be automatically adjusted. Magic.
(The reason you have to use a Panel control as a container is because PictureBox does not inherit directly from the ScrollableControl base class, which is what provides the AutoScroll property.)
I tried this and it worked well. But I noted that if the picturebox is docked in the panel, the picturebox is automatically set to the size of the parent panel, and can't be set larger (at least not in any way I could find). This defeats the purpose of the technique. So -- put the picturebox on the panel, but don't dock it, and it will work perfectly.
There are no automatic scroll bars on a picture box, but you can add the VScrollBar (and HScrollBar) control to the form and handle the image scrolling manually by redrawing it at a different offset each time the Scroll event is fired.