I am a GWT programmer trying to get to grips with using PlayN with Tripleplays gui library.
Having a little bit of trouble working out how to get a border layout filling up all the space of its container. (presumably with the middle space expanding to fill the available size)
BorderLayout border = new BorderLayout(3);
Group mainLayout = new Group(border);
mainLayout.setConstraint(AxisLayout.stretched());
Button Center= new Button("test");
Center.setConstraint(BorderLayout.CENTER);
mainLayout.add(Top);
mainLayout.add(Bottom);
mainLayout.add(Left);
mainLayout.add(Center);
Top Bottom and Left are similarly specified to BorderLayout.Left, top etc.
the whole thing is then added to the root screen with
_root.setConstraint(AxisLayout.stretched());
_root.add(0, mainLayout);
(_root itself just has a AxisLayout.vertical() ...which I am assuming makes it act somewhat like a gwt vertical panel)
At the moment the vertical space seems to be filled, but not the horizontal.
Any ideas where I am going wrong?
I would suggest to set
border.setConstraint(AxisLayout.stretched());
before adding border to mainLayout. This will tell mainLayout to strech this child widget.
Related
I wanted to make my widget fill the parent window, even when the window resizes, so I read this: How to make a Qt Widget grow with the window size?
But this solution created a new problem: my widget automatically re-sizes to the size of the window, but there's padding on the sides of the window. I want the widget to completely fill the parent, and it's not doing that. Look:
Here you can see that the tab widget doesn't entirely fill the parent. I've done some research and have seen that through programming, you can configure the layout to get rid of this padding. Problem is, I'm building my GUI in QDesigner, so I can't just go layout->setMargin(0);
My question is, how to I get rid of this padding on the sides of my window through Qt Designer?
In the bottom of central widget properties there is a section of Layout (it is red), where you can set layout margins. Also, you still can do it programmatically:
QMainWindow::centralWidget()->layout()->setContentsMargins(0, 0, 0, 0);
I am having some trouble making a new QT widget fill all the available space.
I want to add a widget (a QGLWidget) to the verticle layout (mVisual) and have the layout resize so that mVisual occupies the maximal amount of area.
My layout looks as follows:
The code I have is
ui.setupUi(this);
mWidget = new glStream();
//mWidget->setMinimumHeight(480);
//mWidget->setMinimumWidth(480);
ui.mVisual->addWidget(mWidget);
The problem is that if I don't manually set the width or height I can't even see my widget when I add it!
The only thing I can think of is to perform some sort or arithmetic like parentSize-lytControlsSize, but this feels dirty and like MFC.
How can I layout my widgets so that one layout (mVisual) is minimal, while the other is maximal?
if you put your widget in a Layout, widget fill all available space in their parent area, and if you want to fill without margins, set Layout margins to 0.
I am new to QT. I'm trying to understand the layout mechanism by trying to implement this small window seen below. It has the following elements under the QWidget that's the main window:
One big QWidget that stretches on all the client area.
Two QWidget containers on the top of the window. Both should have the same height, but the right one stretches horizontally, as the window grows/shrinks.
one button container widget on the top right, with fixed height and width
Large QWidget container filling the rest of the client area, that should resize as the window resizes.
The parent window itself is resizeable.
I'm looking for hints as to what layout I should use. How do I achieve this programatically? define what stretches automatically, what stays with a fix size? and how the proportions are kept where they need to be kept.
I'd appreciate any pointer you may have.
The easiest, and IMHO best, way to accomplish this is via the QHBoxLayout and QVBoxLayouts. You can do this via the designer in QtCreator, but I find it doesn't work perfectly if you need to adapt things over time. If it's a static set of widgets, I do suggest designing it using the QtCreator designer as it'll greatly simplify your life.
If you're going to do it programatically, the main window should be set to use a QVBoxLayout and then two sub-QVBoxLayout's after that, where the bottom one is configured to take any space it can get. Then in the top QVBoxLayout, add a QHBoxLayout with your two upper components.
to set a widget to fixed size in code you call setFixedSize( int h, int w ) on the widget. To do it in Designer click on the widget and look in the property editor in the QWidget section. open the sizePolicy thingy and set horizontal and/or vertical to fixed. Then open Geometry and set the width and Height.
To make them stretch at different ratios in code you use a separate argument when using a box layout. eg layout->addWidget( button1, 1 ); layout->addWidget (button2, 2); this would cause button2 to expand at twice the rate of button1. To do this in designer, open the sizePolicy property of the widgets and set the HorizontalStrech and/or VerticalSretch. Note that the size policy needs to not be Fixed in this case for the direction you want to set the stretch on. Also it will never let a widget shrink below its minimum size (it would rather mess up the ratio than shrink something too small).
I have a problem in flex scroll bars. I have a mxml component based on canvas. Inside that I have used a VBox for my form. Above that Vbox I have another canvas just for title.
My form gets longer than normal screen size when the grid inside that is filled with more data. In that case I want a vertical scroll bar just for Vbox in which my form is located. But the whole canvas is getting scrollbar including title canvas. how to solve this problem.
I set vertical scrollbar policy of main canvas to off and inside Vbox's VerticalScrollbarPolicy to on. but that's not working. It is not overriding the property of parent container.
Thanks.
Keep your Form inside a Canvas inside the parent canvas instead of VBox. VBox and HBox are set to grow automatically in the parent container, so if your form grows, your corresponding VBox will grow as well.
You want to overload the "updateDisplayList" function for your parent canvas, and force the height of your form Vbox to be canvasHeight-titleHeight (including padding, space, etc...) so that the VBox never grows larger than the screen. This will solve your problem. Just make sure you check for the existence of the VBox as sometimes the updateDisplayList will be called before it has been instantiated.
Had the same problem myself and decided to take the easy route.
Have the following
App->vbox->[vbox + hbox]
components are dynamically being added to last vbox. Wanted hbox to stay on screen and have scrollbars only in vbox above it(2nd vbox).
Was experiencing the same problem. All containers had scroll policy=off except for last vbox, but when dynamically adding components, when the components filled the vbox > 100%, the outer vbox would start to scroll.
Resolution was simple once I went back to the documentation.
Set scroll policy - horizontal and vert on app and first vbox to off, and also added autoLayout=false. This causes the engine to not resize the components after initialization, ie, they are static sized.
Once I added this property, no more scrollbars except for the inner vbox.
Tada!
I'm trying to style vscrollbar and hscrollbar inside a Vbox.But there's always a white square thing at the right bottom cornor which can not be styled.
My CSS is:
ScrollBar{
downArrowUpSkin: Embed(source="assets/images/scrollbar/arrow_down.png");
downArrowOverSkin: Embed(source="assets/images/scrollbar/arrow_down.png");
downArrowDownSkin: Embed(source="assets/images/scrollbar/arrow_down.png");
upArrowUpSkin: Embed(source="assets/images/scrollbar/arrow_up.png");
upArrowOverSkin: Embed(source="assets/images/scrollbar/arrow_up.png");
upArrowDownSkin: Embed(source="assets/images/scrollbar/arrow_up.png");
thumbDownSkin: Embed(source="assets/images/scrollbar/thumb.png");
thumbUpSkin: Embed(source="assets/images/scrollbar/thumb.png");
thumbOverSkin: Embed(source="assets/images/scrollbar/thumb.png");
trackSkin:Embed(source="assets/images/scrollbar/track.png");
fillAlphas:0,0,0,0;}
Could anyone help me out?Much Thanks!
This is a weird one. The white box at the bottom right is actually a (raw) child of the container.
To get around this you need to subclass whatever container you want to add your styled scrollbars to and remove the child called "whitebox":
var whitebox:DisplayObject = rawChildren.getChildByName('whiteBox');
if (whitebox)
rawChildren.removeChild(whitebox);
IIRC you need to do the above in two places: an override of createChildren and an override of validateDisplayList. In both cases remember to call the super class method first!
That area isn't controlled by the scroll bar(s), it's part of the original container. Does the VBox have it's background colour set to black?