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Add buttons example and module #58

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b2756c6
add buttons example and APIs
Feb 10, 2016
db03cd8
change integrated API to module
Feb 10, 2016
d239c48
remove scrolling with button presses
Feb 10, 2016
9de6d08
remove uneeded butkus files
Feb 17, 2016
546d46c
Heiko's comments
Feb 17, 2016
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13 changes: 13 additions & 0 deletions examples/buttons/butkus.json
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{
"input": {
"memoryFormat": "smallest",
"original": "some.url",
"storageFormat": "png"
},
"output": {
"data": "iVBORw0KGgoAAAANSUhEUgAAABcAAAAZBAMAAAAoDqjjAAAAFVBMVEX///9VVQD/qlWqqlUAAAD//6qqVQCmRoadAAAAm0lEQVR42m3PwRECMQgFUOggkAr40QIIHexYgc4WYP9NGMh6Uk68TJIPREQi0ugqAWCXGFm2oQW0HzBm9tP+QA/guDDqUd8IxeNA94IzbjAuUCMJb/QdYURYnVbqvTJl43wmesugcb7WoByNWGbChWdbl3y9sYmeGA5VC3QkQlV7QC3/cjXILKytFxRW6+mGVCa/w8Pf12hSle0Hnx4abYUujacAAAAASUVORK5CYII=",
"gbitmapFormat": 4,
"outputFormat": "png"
},
"success": true
}
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108 changes: 108 additions & 0 deletions examples/buttons/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Buttons Example</title>

<!-- build:template
<script src="../../<%= rockyjs_path %>"></script>
/build -->
<!-- build:remove -->
<!-- this template/remove construct is a workaround as processhtml doesn't support variables for values -->
<script src="../../src/html-binding.js"></script>
<script src="../../src/symbols-manual.js"></script>
<script src="../../src/symbols-generated.js"></script>
<script src="../../src/transpiled.js"></script>
<!-- /build -->

<script src="modules/buttons.js"></script>

<!-- build:css ../../css/bootstrap.min.css -->
<link href="../../html/css/bootstrap.min.css" rel="stylesheet">
<!-- /build -->
<!-- build:css ../../css/style.css -->
<link href="../../html/css/style.css" rel="stylesheet">
<!-- /build -->

<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->

<link rel="stylesheet" href="../common/css/style.css">
</head>
<body>
<div class="container">
<div class="page-header">
<h1>Buttons Example</h1>
<p class="lead">
This is a simple example of how to implement Pebble button clicks in RockyJS using a keyboard's directional arrow keys.
</p>
</div>

<div class="col-md-6">
<canvas id="pebble" class="rocky" width="432" height="504"></canvas>
</div>

<div class="col-md-6">
<h2>What's going on?</h2>
<p>
This example demonstrates how to interact with RockyJS bound to a canvas. Using the left, right, up, and down arrows on your keyboard you can simulate the back, select, up, and down buttons of the Pebble respectively.
</p>

<code>onPress(type, callback)</code>
<p>
Options for <code>type</code> are 'back', 'select', 'up', or 'down'.
</p>
<p>
Source for this example can be found at [link TBD].
</div>
<!-- build:template
<%= github_banner %>
/build -->
</div>
</body>
<script>
var rocky = Rocky.bindCanvas(document.getElementById("pebble"));
rocky.export_global_c_symbols();

/**** App ****/

var currentText = "Press an arrow key";

rocky.update_proc = function (ctx, bounds) {
graphics_context_set_text_color(ctx, GColorBlack);
graphics_draw_text(ctx, currentText, fonts_get_system_font(FONT_KEY_GOTHIC_24_BOLD),
bounds, GTextOverflowModeWordWrap, GTextAlignmentLeft, null);
};

(function() {
onPress("back", function() {
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you put this logic into an anonymous function to not pollute the global namespace but currentText as well as rocky are still globals.

console.log("Back Button Pressed");
currentText = "Back lets us run away.";
rocky.mark_dirty();
});
onPress("up", function() {
console.log("Up Button Pressed");
currentText = "Up and away we go!";
rocky.mark_dirty();
});
onPress("select", function() {
console.log("Select Button Pressed");
currentText = "Select is the best button.";
rocky.mark_dirty();
});
onPress("down", function() {
console.log("Down Button Pressed");
currentText = "Down into the depths we go.";
rocky.mark_dirty();
});
})();

</script>
</html>
23 changes: 23 additions & 0 deletions examples/buttons/modules/buttons.js
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var buttonHandler = {};

window.onPress = function onPress(type, callback) {
if (['back', 'up', 'select', 'down'].indexOf(type) >= 0) {
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you have this nice mapping here, but down in addEventListener() you do an if … else cascade again.

Looking at #73 and our C-API I see that clients want to distinguish between short and long presses. How would you do that?

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@cat-haines asked me to do a simple implementation just with short press.

If you'd like me to do long press as well I can investigate how to do this but it wasn't part of the JIRA's initial scope I don't think.

buttonHandler[type] = callback;
} else { console.log('Invalid type passed to onPress.');}
};

document.addEventListener('keydown', function(event) {
if (event.keyCode === 37 && buttonHandler.back) {
event.preventDefault();
buttonHandler['back']();
} else if (event.keyCode === 38 && buttonHandler.up) {
event.preventDefault();
buttonHandler['up']();
} else if (event.keyCode === 39 && buttonHandler.select) {
event.preventDefault();
buttonHandler['select']();
} else if (event.keyCode === 40 && buttonHandler.down) {
event.preventDefault();
buttonHandler['down']();
}
});
1 change: 1 addition & 0 deletions examples/readme.md
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Expand Up @@ -8,5 +8,6 @@ This folder contains a variety of examples designed to help you understand some
- [Vector Graphics](pdc/index.html) – Draws and modifies vector graphics.
- [GPath](gpath/index.html) – Shows how to use APIs around `GPath`.
- [Text](text/index.html) – Shows how to draw text and use fonts.
- [Buttons](buttons/index.html) - Shows how to interact using keyboard arrows.
- [Community Examples](community.html) - Additional examples built by community members.