Is there a way to create a display (a window) using allegro, in such way that the background of the window would be translucent.
In SDL2 we can achieve that result using this little bit of code:
SDL_SetWindowOpacity(window, 0.5);
Related
I want to implement a bar at the bottom of the screen with the home button - exactly like in Instagram or Messanger apps. I was trying to use a tab bar (https://developer.apple.com/ios/human-interface-guidelines/bars/tab-bars/)
And I would like to utilize system home icon for the tab bar button/item (https://developer.apple.com/documentation/uikit/uiapplicationshortcuticontype/1623374-home)
Is there any simple and straight forward way to set this home icon for the tab bar item?
Some icons can be selected directly from the list in the button/item properties in Xcode, but this home icon is not among them.
I also saved the png from the link above, resized it to 30x30 and added as a picture for the button/item, but it's just showing a grey rectangle.
Apple may or may not provide you with some images. In general no one uses stock images but provide their own. You should do the same.
So "Adding home icon to the tab bar" is pretty much the same as for any other tab bar item. You can add your image and/or text that represents your "home" button. Some images may already be at your disposal but others must be made/bought/stolen by you.
The image you use in tab bar item is only used as a mask and not as an explicit image. What that means is that only alpha component of the image will be taken. In your case you have a black icon on white background which from alpha perspective means you have a rectangle. You will need to remove the white background and make it transparent or use another image that already has these properties.
I am not sure for tab bar but you might also try to open your assets, select your image and then in options on the right find "Render as" and set it to "Original image". Even if this will work the results will not be as you desire (at least in most cases) due to a white background on the image.
In general this option is used to set it to "template" which means whenever you use this image on your components such as UIImageView it will use it's tint color and image alpha component instead of the actual colors from the image. It is a very useful tool but again I am not sure it will work on tab bar item.
You should stop wondering if Xcode is designed to be overcomplicated. Putting aside numerous amount of bugs (and there is really a lot of them) and it being slow (it really used to be faster) it is designed very nicely. But tab bar view controller is extremely high level component. If you don't like it the way it is then simply create your own. All you need is a bottom view with your N buttons which may be shaped any way you can possibly imagine and a container view on which you set a new view controller when one of those buttons is pressed.
Do you guys know if I can set BrowserWindow property to be transparent in the middle of my program and not during the creation time ?, since css based animations on window work only if its transparent, I need the window to show up with background color and then go transparent just before my animation kicks in
There is no way to make a window frameless or transparent after its been created.
I want to create 5 buttons in a title bar of a window using this way: http://delphihaven.wordpress.com/2010/04/19/setting-up-a-custom-titlebar/
Firefox has one button (the same for Opera):
Not maximized window
Maximized window
How to make such buttons for my purpose? Rounded/curved, with bevels, with/without an image, with/without a gradient. Are there similar components? Do I need to make it manually? If so, then how? If it's not a button then what is it? Is there an alternative for it?
For an example of a component that draws on the glass at the top of your form, check out the TRibbon control that comes with Delphi 2010 and above. The source code is included with Delphi. I'd bet that the button is simply an image with an alpha channel. The TRibbon code also draw controls like that on glass.
In the contacts app, the search bar is shown with a white background and it blends in well with the surrounding UI. The only style choices in Interface Builder don't seem to show a way to host just the search bar, but instead includes chrome around it to make it look slightly 3d.
Is there a way to get rid of the surrounding chrome and simply have the search bar overlaid on my own view's background (which happens to be flat black)?
You could use the UIBarStyleBlack .barStyle, or set the .tintColor to black, or set the .translucent to YES.
However, there's no documented way to change the background image of a search bar.
You may use a UITextField with a custom .background and .leftView to simulate the look of a UISearchBar.
I am writing a toolbar-style control and use the ThemeServices unit to paint the background required by the toolbar. Like so:
ThemeServices.DrawElement(Canvas.Handle,
ThemeServices.GetElementDetails(trRebarRoot), ARect);
I then drop child controls onto the toolbar and voila - instant toolbar. Except that every now and again I notice that the nested (child) controls don't repaint as well. So my control paints its background and the child controls disappear until you move the mouse over them.
Some of the edit controls show their client area (no border) and some of them are just gone altogether.
This happens mostly when I place a window from another application over the toolbar and move it away.
I keep thinking this has to be very easy to cure, that perhaps I'm somehow preventing the paint message from reaching the child controls, or missing an override but I have been unable to figure it out.
For this to work properly so you do not end up over-painting the child controls from the WM_NCPaint, you can use the Window's GDI Region functions to create a clipping region which excludes the areas you do not want to paint.
You can do this by creating a Region using the CreateRectRgn (or similar) function with the size of your background.
Select this region in to the DC you are using via the SelectClipRgn function.
Next, loop through the top level child windows on your toolbar / panel and calling ExcludeClipRect with the appropriate coords for each child.
Finally when you paint, only the area's that have not been excluded will be painted.
Also be aware you might need to clear up your region (best check the GDI help).
That's normal for a canvas to have to repaint when covered by another windows control.
You should draw your tool bar in the OnPaint event of the container control.
OK, I found the problem myself. I was drawing the background in WM_NCPAINT because it is a gradiated background that cannot really be drawn bit by bit. I didn't realize that WM_NCPAINT is often called without the client controls being repainted. So I still paint the background in WM_NCPAINT but also in WM_PAINT. The latter is already clipped to exclude the border and to get the former to clip the client area, I called ExcludeClipRect.
This works like a treat.