Looking for a way to animate the header size within a HeaderFooterLayout? I have been attempting to resize it with an animation, but it seems like there is no specific API for this. Are there any techniques or workarounds that can be used to achieve this effect?
To achieve this effect, utilize a Transitionable component. Follow the steps outlined below:
Begin by creating a transition for the animation:
var transition = {
duration: 400,
curve: Easing.inOutQuad
};
Specify the initial and final pixel counts:
var start = open ? 200 : 100;
var end = open ? 100 : 200;
Instantiate a new Transitionable with the initial pixel count:
var transitionable = new Transitionable(start);
Define a function to apply the pixel count:
var applyPixelCount = function () {
layout.setOptions({
headerSize: transitionable.get()
})
};
Attach the function to the Engine event:
Engine.on('applyPixelCount', applyPixelCount);
Queue the transition to the final state:
transitionable.set(end, transition, complete);
For demonstration, please refer to this functional example: http://jsfiddle.net/Mabuti/4or8nxh4/ Acknowledging the use of the source post: famo.us: can I animate the header/footer heights of a header footer layout?, additional context has been provided.
Review the Transitionable documentation for a deeper understanding:
One option to consider is utilizing the well-known-flex LayoutController combined with the HeaderFooterLayout for your layout needs. Here is a snippet of the code to help you get started:
var LayoutController = require('famous-flex/LayoutController');
var HeaderFooterLayout = require('famous-flex/layouts/HeaderFooterLayout');
// Setting up header and content surfaces/views
var header = new Surface(..);
var content = new Surface(..);
// Initializing header-footer layout
var layout = new LayoutController({
layout: HeaderFooterLayout,
layoutOptions: {
headerSize: 40
},
flow: true,
reflowOnResize: false,
dataSource: {
header: header,
content: content
}
});
...
// Adjusting the header height (thanks to flow, it smoothly animates the transition)
layout.setLayoutOptions({
headerSize: 100
});
Get the library here: https://github.com/IjzerenHein/famous-flex
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