I use the following code in a QWebEngineView object to capture a web page to an image:
image=new QImage(w,h, QImage::Format_ARGB32);
painter = new QPainter(image);
render(painter);
image->save(imagefilename);
Unfortunately, it only renders part of the web page that is shown on the widget to the image. How to render the whole page to the image?
It is possible to hide webview and resize it to show the whole web page. I'm using PyQt5 (version 5.12), but the idea should apply to C++ Qt as well:
# Create hidden QWebEngineView
view.setAttribute(Qt.WA_DontShowOnScreen)
view.show()
...
# Resize the view and then capture image
def take_screenshot():
view.grab().save(output_file, b'PNG')
size = view.page().contentsSize().toSize()
view.resize(size)
QTimer.singleShot(1000, take_screenshot)
Related
I use Qt 5.5.0 and Qt Creator 3.4.2 on Mac-book, I want to open second qml on button click, I want to develop application in which login page come and after login control move to next page.
I try suggestion of stackoverflow, but still I face problem to open next qml on button click.
I tried
button2.onClicked:{
var component = Qt.createComponent("test.qml")
var window = component.createObject(root)
window.show()
}
How can I create a new window from within QML?
In upper case error come related to root, ReferenceError: root is not defined. I gave root id in test.qml file.
I also tried many more example to solve to develop functionality. Please give brief idea or code to develop this functionality.
The code below works, Take note of the property status and the function errorString() – they will give you information in debugging (.e.g. "file not found" errors, components not ready, etc).
See these pages for background:
Dynamic QML Object Creation from JavaScript
Component QML Type
Window QML Type
function createWindows() {
var component = Qt.createComponent("Child.qml");
console.log("Component Status:", component.status, component.errorString());
var window = component.createObject(root, {"x": 100, "y": 300});
window.show();
}
For this type of ui I'd use [StackView][1] component that allows also animations between transitions. Other solution is to use a Loader component.
I am creating an winAPI application in c++ I have a photo in preview pane and I want to create two buttons NEXT and PREVIOUS on clicking them I will go to the next page .
Could you please give me the idea how to do that in c++ ??
Do I need to use QT libraray or it can be done using the in built function of WinAPI like -
HWND hwndButton1 = CreateWindow(L"BUTTON",L"NEXT",WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,550,800,100,30,m_hwndPreview,(HMENU)buttonid1,(HINSTANCE)GetWindowLong(m_hwndPreview, -6),NULL);
HWND hwndButton2 = CreateWindow(L"BUTTON",L"PREVIOUS",WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,650,800,100,30,m_hwndPreview,(HMENU)buttonid2,(HINSTANCE)GetWindowLong(m_hwndPreview, -6),NULL);
and then using WM_COMMAND for both the button clicks.
Am I going right?
I just want my API application work like a .pdf extension file...as in PDF files we have up and down arrow and on clicking upon them we can go to the next page..In winAPIc++ I couldn't find any such arrow function.. please tell me if there is any such arrow up/down function present to go to next page (because I am very less interested in creating NEXT and PREVIOUS button using createwindow function.. It looks odd).
You have not mentioned what tools you are using, so we don't know if you have a resouce editor. You should research that in a forum appropriate for the tools. If you think writing one line of code to create a button is "very complicated" then you need a better tool.
If you do not want the buttons to appear on top of the picture then you need another place to put them. One common possibility is a toolbar. It is a strip for buttons along the top or bottom of the main window:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb760435(v=vs.85).aspx
With a resource editor you can draw an arrow on the button. Without a resource editor you can set the button text to a unicode arrow:
SetWindowText(hwndButton1, L"\x25bc"); // down arrow, use 25b2 for up arrow
Most buttons (and other controls) are created using a resource editor, placing the controls on a dialog template or a toolbar resource. If you do that Windows will create the buttons when you create the dialog or toolbar. This method is much preferred because Windows will adjust the size of the buttons as required for the screen settings in use.
If you can't do that you must use CreateWindow as you are doing.
Finally it is done.. I have created the buttons neither using Qt or nor using any createWindowEx..The best and easy approach to follow is resource editor ...just put some button on dialog and use IDD_MAINDIALOG (in my case)
m_hwndPreview = CreateDialogParam( g_hInst,MAKEINTRESOURCE(IDD_MAINDIALOG), m_hwndParent,(DLGPROC)DialogProc, (LPARAM)this);
and then
BOOL CALLBACK AMEPreviewHandler::DialogProc(HWND m_hwndPreview, UINT Umsg, WPARAM wParam, LPARAM lParam)
{
switch(Umsg) // handle these messages
{ .........
}
....
}
and thats done. Very easy task.
I have screen 1 on which there is a SUBMIT button. On click of the submit button I want to load another screen 2. the UI of screen 2 is developed using only Qt C++. there is no QML document related to that.
On the click of the submit button I have called a function void DoSubmit(). In this function I have made a page object.
Page * PageObj = new Page();
In this PageObj I have added containers and other controls and constructed my UI for scene 2, now I try to set this page as my current scene using the following command:
Application :: instance()->setScene( PageObj );
by doing so my app getting crashed but when I remove the statement containing Application :: instance()->setScene( PageObj ) it does not crash.
What is the problem in this I am not able to figure out. Please help..
The scene should not be used for adding a page, just the first one. You would better use a navigationPane or a sheet.
See the doc:
https://developer.blackberry.com/cascades/documentation/ui/navigation/index.html
I am trying to figure out how to open a pop up window in my Air application, in a secondary Window, instead of the main application window.
I am using the ReusableFX components, which include a custom DataGrid with filtering and other capabilities. The filtering feature displays a pop up window via PopUpManager when you click on the top of a column in the grid.
PopUpManager.addPopUp(this, FlexGlobals.topLevelApplication as DisplayObject);
The problem is that the pop up window opens in the main application - I am assuming because of the 'topLevelApplication' reference.
So, I need a way to open this window in the current Air "s:Window".
I am assuming I need a way to walk up : this.parent.parent or this.owner.owner - though I have tried that and it did not seem to work (it said null reference).
OR, is there a way to get the current top most window / component (NOT the main application / window)?
Update:
I decided to create a new project for the component, and add in the Air libraries. Now I am able to access the "NativeApplication.nativeApplication.activeWindow" call. That gives me the correct Air window. However, it does not seem to be working:
PopUpManager.addPopUp(this, NativeApplication.nativeApplication.activeWindow as DisplayObject);
My popup does not appear. I am assuming because "activeWindow" is not actually a DisplayObject? (so how do I get the DisplayObject if that's the case?)
Update:
Could it be that I am a victim of this adobe bug? (found here originally)
Well, I came up with some changes that seem to work, though there is probably a much cleaner way to do this - I was just not able to figure a way to get a reference to the current air application window except this way (this is using the ReuableFX custom flex component by the way):
First, in my custom DataGridColumn component, I added a public property
public var pApp:Object;
Next, I modified the DropDownFilterHeaderRenderer (extends HBox , implements IListItemRenderer), showFilterDropDown method and right before it calls dropDown.startEdit(column); , added:
column.pApp = parentApplication;
Finally, I modified DropDownFilterEditor (which extends FilterEditorBase), the method startEdit(column:MDataGridColumn) (the previous PopUpManager was calling FlexGlobals.topLevelApplication, which is not the correct window when opening a s:Window in an Air native application:
var editorInstance:Object = _editor.parent;
var columnInstance:Object = editorInstance.column;
var parAppInstance:Object = columnInstance.pApp;
PopUpManager.addPopUp(this, parAppInstance as DisplayObject);
I have a flex 3 application that creates an Image from a canvas which the user draws on. I use the ImageSnapshot class to create the image
var imageSnap:ImageSnapshot=ImageSnapshot.captureImage(myCanvas);
var imageByteArray:ByteArray=imageSnap.data as ByteArray;
I want the user to be able to print or save the image. I can use the following code to print the image but flex does not provide good control over printing across multiple pages
var printJob:FlexPrintJob=new FlexPrintJob();
printJob.start();
printJob.addObject(myCanvas, FlexPrintJobScaleType.SHOW_ALL);
I would like to display the image in a browser window so that the user could print it using the built in browser functionality or right click on the image and save it. Can this be done without requesting server side code to do it?
I know that flash player 10 and flex 4 allow you to save files locally but for now I am stuck with player 9 and flex 3
You can still use the new features of FileReference (the save() and load() methods) in Flex 3 as long as the application is running in Flash Player 10. But if you are definitely stuck with Flash Player 9 then you will need to push the image up to the server first. If you are looking for a good way to push that data up to the server, please reference my solution in this question:
Flex: Render an unrealized UIComponent to BitmapData?
I don't believe you can do this, as it would violate the sandbox. For example, if this worked, it means you could put arbitrary code (analogous to an image) on the user's machine without their consent or knowledge.
I'm not sure if this will work, but try this:
Show a link to the image (file://path/to/image/img.ext) and set window.htmlLoader.navigateInSystemBrowser = true;