I want to combine multiple views into one, using React Native Animated Component.
Details
Each View should be located in the different position.
Each View should be increasingly expand width, height in the owns position.
All Views should be combined into one which is located in the middle of position of all Views when reached to max width, height.
The change of the size(width, height) of all Views should be determined by the zoom of screen. (You don't worry about it because I had already knowledge about this way.)
Related
I'm using the SpanLabel Component, but on the screen the text content does not occupying the full width when text size is lower
Someone can help please?
This can happen if the width isn't deterministic. The SpanLabel won't be able to reflow and at best will cause only its own Container to resize. There are two solutions:
Deterministic hierarchy - this is generally best but not always possible
Use TextArea - sometimes this works around the issue by reducing the hierarchy depth.
Deterministic layout means that the size of the elements is determined in a clear way by the hierarchy. E.g. BoxLayout.Y is deterministic on the X axis as it gives the components on the X axis all available space. FlowLayout isn't deterministic as it gives components their preferred size.
Some layouts can go back and forth and vary in determinism based on their axis.
This is important because when we layout the components we go from top down. So we go through the Form to its children asking each for their preferred size. If at this point the SpanLabel doesn't know its size it can give the wrong value and we can't really fix that later as we don't reflow the UI. Reflow would create a potential infinite loop and a performance problem at best.
We try to workaround some of this behavior by making a revalidate() call within TextArea but that has its limits. If the hierarchy is too deep the preferred size is already set and won't adapt. SpanLabel is just a Container with a TextArea and a Label (for the icon). So by only using a TextArea you'd slightly simplify the hierarchy and it sometimes might be enough. E.g.
TextArea t = new TextArea(myText);
t.setEditable(false);
t.setFocusable(false);
t.setUIID("Label");
I've been playing around with Codename One for a while now, but I can't seem to design a layout that I had planned with the layout managers provided. How should I go about designing the following layout?
I want a component on the left with a specific width, a component on the right with a specific width, and a center component that stretches or shrinks to the space that is leftover by the other two. If this was an html/css table, it would be something like:
<td style="width:50px;"></td><td style="width:auto;"></td><td style="width:50px;"></td>
TableLayout gets close, but the widths are defined in percentages only. BorderLayout and GridLayout bases the sizes on the prefered size of the largest component, but the setPreferedSize() method is deprecated, and setSameWidth() is suggested instead, but that doesn't seem to do what I need it to in this circumstance.
If you want a component to have the right size for the image just place the image as an icon in a label and its preferred size will be the size of the image+padding which should give you exactly the effect you want by default.
Notice that the server sent images should differ in size based on the device DPI otherwise your app might look ridiculous on some devices. See this course for how we handle image requests to the server: https://www.udemy.com/build-mobile-ios-apps-in-java-using-codename-one/
I have a RichEditControl with a given width and height. It's usually a one page document, but sometimes documents can get longer than that. When that happens, the RichEditControl adds a page to it underneath the current one, and a vertical scroll bar to navigate both.
Is there a way to make the document show only one page at a time, so I see Page 1 by default until I write enough to get a page jump, and then I only see page 2 in screen?
This would probably require some sort of pagination, which I imagine is not built-in, so my derived question is:
Since there is no ability to re-size control based on content size (source), would it be better to just count the number of pages, and make the RichEditControl height a multiple of that number? Since this is all inside a bigger ScrollViewer, I'm trying to avoid more inner scroll bars.
I am new to silver light and would like to understand a bit more from the pros. Let me tell you what I am trying to do. I am into photography and my goal is to create a web site that allows users to view their images and be able to rotate, zoom, crop, special effect etc. I have developed the web site that allows users to order pictures but now I want to start working on the actual picture/image manipulation. So for testing i put a canvas and a rectangle( with an image). Placed a slider and was able to link the slider to the rectangle. As i increase the slider the image gets larger. But I was kind of hoping as the image gets larger it does not surpass the boundries of the canvas. I assumed that is what it means by being a child of a canvas. Am i mistaken? If so how do you suggest me doing this? Remember I am very new to this and may be going about this very wrong.
Thanks!
Your are right. In Silverlight (like in WPF, WinForms etc.) gui-elements form a hierarchy of elements wherein controls can act either as parents or as children.
The reason why your rectangle surpasses the boundaries of it's container lies in the way controls are getting aligned. This depends on what kind of container you want to place your child into.
In a canvas for example you position the children with absolute measurements (left, top, height, width). In a self-organizing container like the StackPanel you choose an horizontal alignment (Left, HCenter, HStretch, Right) or a vertical alignment (Top, VCenter, VStretch, Bottom) which determines the childs behavior when you place it inside the parent. Furthermore you can specify the dimension of the child (Width, Height) and an optional margin which determines the gap between the Top, Right, Bottom and Left bound of your child to its enclosing parent.
But what ever container you choose it's inherent to it that you can let its children surpass its boundaries e.g. with a margin that is negative or greater than the container boundaries or simply by an child that is bigger in dimension that its container as you described the situation with your rectangle.
In your case I would consider working with the idea of clipping. Clipping simply means to
(1) define an geometrical area (in Silverlight and WPF it is a Path object) which lies over some graphical context (some section of your ui or your control etc).
(2) what lies inside the boundaries of this clipping area remains visible and everything else remains invisible.
So you can think of a clipping area as a window onto your screen which you use to look through.
When you are using Microsoft Blend this is easy to realize:
(1) Just use a geometrical shape like a Rectangle, a Circle or a custom Path.
(2) Place it somewhere upon your UI
(3) Right-click the shape, select "Path" and then "Make clipping Path"
(4) and voulà, you've just defined a clipping area which you can modify as you are used to modify controls.
Hope this gave you an idea how to deal with your problem.
cheers.
I have a control that has a list that varies in length greatly. This control appears in various places meaning that i cannot calculate its position and desired height easily.
Moreover all I want is for the scrollviewer to simply size itself according to its parent. currently it insists on sizing itself according to the content.
currently when i have a list that exceeds the height of the screen the whole control extends off the bottom and the scrollviewer shows no bar (because it has stretched to the heigth of the contents and so thinks it is not required).
I've not included code as the object graph is fairly deep.
What i am looking for is a set of conditions that would cause the scrollviewer to resize itself according to its content rather than its parent.
I have it working in a similar situation involving grids and datagrids, the unique part of this control is that there is a list containing controls.
Any ideas? I would prefer solutions that don't require use of code behind - but im really not in a position to be choosey.
Here are common reasons that come to mind that would allow a scroll viewer to size to its contents rather than to its "parent":-
It's placed on a Canvas or a StackPanel
It's assigned to a Grid row/column with it's Horizontal or Vertical alignment not set to Stretch and its content size is less than the size of the row or column.
Its ultimately upto the containing panel how it chooses to size a child element so its not really possible to dictate this completely from code inside the child.