Creating a Qt Widget Based Application

Select the light bulb icon next to the type name to open the Qt Quick Toolbar for rectangles.

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You can use it to specify rectangle properties, such as color, transparency, and gradients. Next, add an Image type with qt-logo. You can also use any other image or a component. Position the image in the top-left corner of the rectangle:. You can use the Qt Quick Toolbar for images to specify image properties, such as source file and fill mode. Now, create the rectangles that the image will move between. Their size should match the image size and they should be transparent, so that the image is visible. Set the border color to light gray to make the rectangles visible:.

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Anchor the rectangles to their parent to position them in its top-left and bottom-left corners, as well as the vertical center of its right edge. The following code snippet anchors a rectangle to the top-left corner of its parent:. Add a MouseArea type to make the rectangle clickable by users:. Next, make the image move between the rectangles when users click them by adding states and by connecting mouse clicks to state changes. To make the image move between the rectangles when users click them, add states to the Page component where you change the values of the x and y properties of icon to match those of the middle right and top left rectangles. To make sure that the image stays within the rectangle when the view is scaled on different sizes of screens, bind the values of the x and y properties of icon to those of the rectangles:. Then, connect the onClicked signals of the mouse areas to the state changes:. Create transitions to apply animation to the image.

For example, the image bounces back when it moves to middleRightRect and eases into bottomLeftRect. Change the easing curve type for transitions to State2 from linear to Easing.

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OutBounce to create the bounce effect:. Note: You can use the Qt Quick Toolbar for animation to specify the easing curve type and animation duration. Then, change the easing curve type for transitions to State2 from linear to Easing. InOutQuad to create the easing effect:. To return to these instructions, open the Help mode. Begin by designing the user interface and then move on to filling in the missing code. Finally, add the find functionality. Note: To easily locate the widgets, use the search box at the top of the Sidebar. For example, to find the Label widget, start typing the word label. Applying the horizontal and vertical layouts ensures that the application UI scales to different screen sizes. The textfinder. You need to add a private function, loadTextFile , to read and display the contents of the input text file in the QTextEdit. You need a resource file.

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The input file can be any. Create a text file called input. For the text file to appear when you run the application, you must specify the resource file as a source file in the CMakeLists.