translucency

问题 I'm trying to accomplish the following with a Qt (C++) app, cross OS. Upon running the program a new window pops up, a fullscreen QWidget. Now I want this to be see-through/transparent, so the user won't actually see it. On this 'layer' a user can drag his/her mouse to draw a (red) rectangle to select an area which is - when the mouse is released - taken a screenshot of. The problem: The issue lays in the whole transparent layer thing since this doesn't appear to work well cross OS. Because

问题 In my problem I have an opaque JPanel and another JPanel that is translucent(semi-transparent) which sits on the first JPanel. When I have added radio buttons onto the top JPanel. The problem is every time I enter mouse over the area of the label of each radio button(and every time I move mouse away from the label), it gets darker and darker. package trial; import java.awt.Color; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing

问题 In the following code why i'm getting an invisible window?What does setUndecorated() do and where it is used for. import java.awt.Color; import java.awt.Dimension; import java.awt.Toolkit; import javax.swing.JFrame; import javax.swing.SwingUtilities; public class UsingJLayer { UsingJLayer() { JFrame jfrm=new JFrame("Picasa Viewer"); jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Dimension dim=Toolkit.getDefaultToolkit().getScreenSize(); jfrm.setSize(dim); jfrm.setUndecorated(true); jfrm

问题 I'm in the need of a translucent AWT component/container to be placed on top of other components to receive the mouse events. The problem here is to create a translucent component. My investigation so far showed that Swing has the possiblity to do setOpaque(false) on e.g. a JPanel. Is there something similiar for AWT? The idea is to make a ScrollPane scrollable by simply clicking somewhere and moving the mouse around. Thats why I need a transparent component to place it above all other

问题 I want to play a movie on a QWidget that has Qt::FramelessWindowHint flag and Qt::WA_TranslucentBackground attirbute using QVideoWidget or QGraphicsVideoItem. But the video is not visible. I hear only sound. What is the problem? Edit: #include "videoplayer.h" #include <QtWidgets/QApplication> #include "qboxlayout.h" #include "qvideowidget.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); QWidget *w = new QWidget; w->setWindowFlags(Qt :: Window | Qt::FramelessWindowHint ); w-

问题 My navigation bar colours appear normally in iOS 7 Deploying iOS 6.0, but if the system version is iOS 7.0 or later, some of the navigation bar colouring doesn't display properly on iPhone 4. Works fine in iPhone 5. Here's how I am doing it: if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) { self.edgesForExtendedLayout = UIRectEdgeNone; [self.navigationController.navigationBar setBarTintColor:[UIColor blueColor]]; [self.navigationController.navigationBar setTranslucent:YES]; } #define

问题 I've been looking around and it seems like the answer is no, but the posts are dated so I was wondering if this has changed. Is it possible to set the status bar to translucent? I'm trying to do a fade-in/fade-out effect on a multitouch tap but the status bar keeps coming up as solid black. Thanks! -- edit -- The code I'm using for the event transition is below. I have set the statusbar to translucent in the -info.plist, but I noticed there's no Black Translucent setting in IB (which is

问题 I'm trying to paint a rectangle on my application in a red shade but I need to make it sort of transparent so that the component under it will still show. However I still want that some colour will still show. The method where I'm drawing is the following: protected void paintComponent(Graphics g) { if (point != null) { int value = this.chooseColour(); // used to return how bright the red is needed if(value !=0){ Color myColour = new Color(255, value,value ); g.setColor(myColour); g.fillRect

问题 I'm using XCode 5.02 and iOS7 SDK. I'm trying to set my navigation bars as translucent but when I do that, they become completely transparent instead. The status bar will also be transparent. I can see the title and buttons on the navigation bar but no background. The same happens in all view controllers in my project, so this is not bound to specific view. When I set translucent = NO, I get solid colors. This is both in the simulator and on a device running iOS7. I have tried setting

问题 I wish to have a transluscent background for an activity, so that the previous activity can be seen beneath this activity. Something like a transluscent menu that pops up over a videa being played in the background. Is this possible? Can you tell me how? Note:I cannot use the default transluscent theme from android, since I am using my own customised background and theme for my application. Pls help. Below is my style.xml wherein my_btn and my_list are selectors : <?xml version="1.0" encoding