How to utilize PropertyName in Geotools for a user-defined function? - gis

I am attempting to use the geotools.org library (Version 24) to write a user-defined function to style my GIS map according to an external data source. The documentation for the GeoTools library includes this tantalizing paragraph in the section on Functions:
When a function is used as part of a Style users often want to calculate a value based on the attributes of the Feature being drawn. The Expression PropertyName is used in this fashion to extract values out of a Feature and pass them into the function for evaluation.
This is exactly what I want to do. However, the documentation includes no actual example of how to do this.
I have spent several days trying various permutations of the Function definition, and I get the same result every time: My user-defined function only receives the geometry attribute, not the extra attributes I have specified.
I have verified that everything else works:
The features are read correctly from the shapefile
The function is actually called
The Feature geometry is passed into the function
Upon completion, the map is drawn
But I cannot get the Geotools library to pass in the additional Feature properties from the shapefile. Has anyone gotten this working, or can you even point me to an example of where this is used?
My current function definition:
package org.geotools.tutorial.function;
import mycode.data.dao.MyTableDao;
import mycode.data.model.MyTable;
import org.geotools.filter.FunctionExpressionImpl;
import org.geotools.filter.capability.FunctionNameImpl;
import org.opengis.feature.Feature;
import org.opengis.filter.capability.FunctionName;
import org.opengis.filter.expression.PropertyName;
import org.opengis.filter.expression.VolatileFunction;
import org.springframework.beans.factory.annotation.Autowired;
import java.awt.*;
import java.beans.Expression;
import java.util.Random;
public class DataFunction extends FunctionExpressionImpl {
#Autowired
MyTableDao myTableDao;
public static FunctionName NAME =
new FunctionNameImpl(
"DataFunction",
Color.class,
FunctionNameImpl.parameter("featureData1", PropertyName.class),
FunctionNameImpl.parameter("featureData2", PropertyName.class));
public DataFunction() {
super("DataFunction");
}
public int getArgCount() {
return 2;
}
#Override
public Object evaluate(Object feature) {
Feature f = (Feature) feature;
// fallback definition
float pct = 0.5F;
if (f.getProperty("featureData1") != null) {
MyTable temp = myTableDao.read(
f.getProperty("featureData1").getValue().toString(),
f.getProperty("featureData2").getValue().toString());
pct = temp.getColumnValue();
}
Color color = new Color(pct, pct, pct);
return color;
}
}
EDIT: I am invoking the function programmatically through a Style that is created in code. This Style is then added to the Layer which is added to the Map during the drawing process.
private Style createMagicStyle(File file, FeatureSource featureSource) {
FeatureType schema = (FeatureType) featureSource.getSchema();
// create a partially opaque outline stroke
Stroke stroke =
styleFactory.createStroke(
filterFactory.literal(Color.BLUE),
filterFactory.literal(1),
filterFactory.literal(0.5));
// create a partial opaque fill
Fill fill =
styleFactory.createFill(
filterFactory.function("DataFunction",
new AttributeExpressionImpl("featureData1"),
new AttributeExpressionImpl("featureData2")));
/*
* Setting the geometryPropertyName arg to null signals that we want to
* draw the default geomettry of features
*/
PolygonSymbolizer sym = styleFactory.createPolygonSymbolizer(stroke, fill, null);
Rule rule = styleFactory.createRule();
rule.symbolizers().add(sym);
FeatureTypeStyle fts = styleFactory.createFeatureTypeStyle(new Rule[] {rule});
Style style = styleFactory.createStyle();
style.featureTypeStyles().add(fts);
return style;
}

I think you want to set up your function to take a pair of Strings or Doubles (or whatever those attributes are) so something like:
public static FunctionName NAME =
new FunctionNameImpl(
"DataFunction",
Color.class,
FunctionNameImpl.parameter("featureData1", Double.class),
FunctionNameImpl.parameter("featureData2", Double.class));
public DataFunction(List<Expression> params, Literal fallback) {
this.params = params;
this.fallback = fallback;
}
then your evaluate method becomes:
#Override
public Object evaluate(Object feature) {
Feature f = (Feature) feature;
// fallback definition
float pct = 0.5F;
Expression exp1 = params.get(0);
Expression exp2 = params.get(1);
if (f.getProperty("featureData1") != null) {
MyTable temp = myTableDao.read(
exp1.evaluate(f, Double.class),
exp2.evaluate(f, Double.class));
pct = temp.getColumnValue();
}
Color color = new Color(pct, pct, pct);
return color;
}
and you would use it in the style using something like:
Fill fill =
styleFactory.createFill(
filterFactory.function("DataFunction",
filterFactory.propertyName("featureData1"),
filterFactory.propertyName("featureData2")));

Related

Using objects instead of arrays

I've spent nearly 1 week to learn working with objects instead of arrays. I had thought it was easy to call them and created some objects and set their properties. However I can't access them now, I tried this:
function onBoxClick(event:MouseEvent):void {
var str:String = event.currentTarget.name;
trace(str);
str = str.substring(str.indexOf("_") + 1);
trace(getChildByName("copy_" + str)); // trying to trace an object by name
}
My question is if there's a practical way of dealing with objects, otherwise what's the purpose of using them.
Edit: Here's my function that I use to create movieclips and other things:
function addBoxes(isUpdate:Boolean):void {
var copyOne:Object = getReadOnlyValues();
copyOne.name = "copy_" + num;
// Set default mc1 settings
var settings1:Object = copyOne.mc1Settings;
for(var num2:String in settings1) {
copyOne.mc1[num2] = settings1[num2];
}
// Set default mc1text settings
var settings2:Object = copyOne.mc1TextSettings;
for(var num3:String in settings2) {
copyOne.mc1Text[num3] = settings2[num3];
}
copyOne.mc1.x = nextXpos;
copyOne.mc1.name = "captionBox_" + num;
addChild(copyOne.mc1);
copyOne.mc1.addEventListener(MouseEvent.CLICK, onCaptionClick);
copyOne.mc1Text.name = "captionBoxText_" + num;
copyOne.mc1.addChild(copyOne.mc1Text);
// ---------------------------------------------------------------
// Set default mc2 settings
var settings4:Object = copyOne.mc2Settings;
for(var num4:String in settings4) {
copyOne.mc2[num4] = settings4[num4];
}
// Set default mc2text settings
var settings5:Object = copyOne.mc2TextSettings;
for(var num5:String in settings5) {
copyOne.mc2Text[num5] = settings5[num5];
}
copyOne.mc2.x = nextXpos;
copyOne.mc2.y = copyOne.mc1.height;
copyOne.mc2.name = "box2_" + num;
addChild(copyOne.mc2);
copyOne.mc2Text.name = "box2BoxText_" + num;
copyOne.mc2.addChild(copyOne.mc2Text);
copyOne.mc2.addEventListener(MouseEvent.CLICK, onBoxClick);
if (num / subunits is int) {
trace (num);
// createMc("normalBox", true);
}
nextXpos = nextXpos + copyOne.mc2.width;
// traceObj(copyOne);
// traceObj(getReadOnlyValues());
}
I called this function in a loop so I created many movieclips. Now I can't access objects' properties and their childen (e.g textfield).
Objects I have on stage: Movieclips and textfields
Where they come from: The function above
What I'm trying to do with them: Tracing movieclips and textfields (that are holded by objects) to change their children (textfield) text
What happens instead of what I expect: Trace code outputs undefined instead of giving me object type trace(getChildByName("copy_" + str)); // trying to trace an object by name
Is there a practical way of accessing an object whose name is "copy_1" and its property whose name is "box2_1" (movieclip)?
One problem I see is the "copyOne" object has been created within the scope of "addBoxes", so it will no longer exist outside of this function.
Another is you're trying to access an Object via getChildByName, which only addresses displayObjects of the displayObjectContainer you are calling from.
If you want to loosely keep track of variables with things like Objects or MovieClips (which are both dynamic-style objects that let you add properties to them as you wish), just use MovieClips to house your values. The movieClips, being on the stage, will be retained in memory until removed from the displayList (stage).
Also, check out the Dictionary, a sort of key/value based way of storing collections of objects.
Better yet, if you use strongly-typed custom objects (creating your own classes to extend MCs, and adding your own public or private methods and values), there are benefits such as using Vectors (fancy, fast arrays that are compatible with any Object type you choose).
I don't really know if I understood your question or not, but as #ozmachine said in his answer, you can not use getChildByName, instead I think that you can take a look on this, may be it can help :
var container:DisplayObjectContainer = this;
function getReadOnlyValues():Object {
return {
mc1: new box(),
mc1: {
name: 'mc1_',
alpha: 1,
x: 0,
y: 0,
width: 30,
height: 25
},
mc1Text: new TextField(),
mc1Text: {
text: 'test',
x: 0,
y: 0,
selectable: false,
multiline: false,
wordWrap: false
}
}
};
// create 5 objects
for(var i=0; i<5; i++){
container['copy_'+i] = getReadOnlyValues();
var obj:Object = getObjectByName('copy_'+i);
obj.mc1.alpha = 1;
obj.mc1.x = 0;
obj.mc1.y = 50 * i;
obj.mc1.width = 100;
obj.mc1.addChild(obj.mc1Text);
obj.mc1Text.text = 'test_' + i;
addChild(obj.mc1);
}
// get object by name
function getObjectByName(name:String):Object {
return container[name];
}
// change the text of the 4th button
stage.addEventListener(MouseEvent.CLICK, function(e:MouseEvent):void {
var obj:Object = getObjectByName('copy_3');
obj.mc1Text.text = 'new text';
})
Array and Object are both data structures.
Data means some form of information.
Data structure means some form of information being stored in a certain way.
Array and Object are two different ways to store information.
Arrays identify data with integer numbers.
An integer number to identify a single element of an array is called an index
Arrays are ideal to represent a list of similar things that belong to each other.
var names:Array = ["John", "Paul", "George", "Ringo"];
This often means that the elements of an array are of the same type, like in the example above.
But they don't have to:
var numbers:Array = [42, "twenty-five", "XIIV"];
For the above examples it's easy to answer the questions "What are the names of the four beatles?", "What different representations of numbers did you stumble upon during your trip through the historic town?". Other questions are harder or impossible to answer. "What Roman numerals did you stumble upon in the historic town?"
Objects identify data with names.
A name to identify a single element of an object is called a property
Objects are ideal to represent a list of dissimilar things that belong to each other.
var paula:Object = {age:37, name:"Paula", hairColor:0x123456};
This often means that the elements of an object are of different type, like in the example above.
But they don't have to:
var car:Object = {manufacturer:"Porsche", color:"red", sound:"wroooooom", soundOfDriver:"weeeeeeeeeeee"};
Considering this, let's take a look at your code and see how it applies.
The big picture is that you have a function addBoxes that you call multiple times. As one function should have one purpose, this function will do something similar every time it is executed. Uh-Oh: "similar". Whatever the result of this function is, it should go into an array. Each call to that function would be an element of the array. You can see this clearly on your use of "num" to identify whatever is happening in your current run of the function.
What data is present in your function?
copyOne
mc1
mc1Text
mc2
mc2Text
copyOne is a troublemaker here and what causes your confusion. It's trying to do everything at once and therefore you are not able to think clearly about when to use a Array and when Object. One would call it a god object. And that's not a good object to have around.
Your choice for variable names is very bad.
You choose super generic names like "mcX" only to later add a name property to it that describes what it truly is.
But even that doesn't hold true for whatever "Box2" is supposed to be.
Choose names so that it'S easy to understand what something in your code is.
It looks like you created all or parts of this structure jsut for this question and therefore lacked meaningful names.
I highly recommend that you do not learn by such made up projects. But from the real world.
I will therefore impose the following goal:
mc1 and mc1Text represent a caption
mc2 and mc2Text represent a content
With all this, I ask again:
What data is present in your function?
captionBox
captionText
contentBox
contentText
Both caption and content consist of a box and a text.
These are different things, so caption and content are each an object with properties "box" and "text"
One could think that due to this similarity, they both should go into an array.
But I beg to differ. A caption and a text are not the same thing. You deal with captions and texts differently. Walking on the streets you might catch a big caption in the news quickly, but not a lengthy text. That's why each of them should be a property of the object that's created in the function.
Here's somewhat of a conclusion:
var allBoxes:Array = []; // array to store the similar results of every function call
function createBoxes():void
{
var boxes:Object = {};
//the box consists of caption & content, both bying of the same type, but are containing different data
boxes.caption = {box:{}, text:{}}; //caption
boxes.content = {box:{}, text:{}}; //content
allBoxes.push(boxes);
}
This is it. That's how and why I would model your data with objects and arrays.
But it doesn't end here. My conclusion lacks a lot of the code you posted.
While the above is mostly language independent, the missing code is specific to Actionscript and not just on how to model data. It's as follows...
As3 is object oriented.
This is good, because the above conclusion has a lot of objects in it.
To define how some object is/does/moves/farts/etc, one creates classes.
The following changes take place (for reasons out of the scope of this answer):
createBoxes (formerly known as addBoxes) calls the constructor of
a class "CaptionAndContent" that extends Sprite.
There's no more need to explicitely create an object "boxes" as the constructor does exactly that.
The caption and content will not have a property "box", because
they can be the box themselves. This is exactly how it's done in the
code of the question. The default settings are set in the constructors of their classes.
Here's reduced snippet of code that hopefully illustrates how the classes could look like.
Each class should be in its own file, with the necessary imports, package block and the additional functionality that you did not specify in your question.
public class CaptionAndContent extends Sprite
{
private var caption:Caption;
private var content:Content;
public function CaptionAndContent(captionText:String = "", contentText:String = "")
{
caption = new Caption(captionText);
addChild(caption);
content = new Content(contentText);
content.y = caption.height;
addChild(content);
}
}
public class ClickableBoxWithText extends Sprite
{
protected var textField:TextField;
public function ClickableBoxWithText(text:String = "")
{
textField = new TextField();
textField.text = text;
addChild(textField);
addEventListener(MouseEvent.CLICK, onClick);
}
protected function onClick(mouseEvent:MouseEvent):void
{
//override this in a sublclass
}
}
public class Caption extends ClickableBoxWithText
{
public function Caption(text:String = "")
{
super(text);
// apply all the default settings of caption here.
}
}
public class Content extends ClickableBoxWithText
{
public function Content(text:String = "")
{
super(text);
// apply all the default settings of content here.
}
}
Using them would look something like this:
var allBoxes:Array = []; // array to store the similar results of every function call
function createBoxes():void
{
var captionAndContent:CaptionAndContent = new CaptionAndContent("This is the caption...", "...for this content");
captionAndContent.x = nextXpos;
addChild(captionAndContent);
allBoxes.push(captionAndContent);
}
Last but not least, the identification problem in the click handler.
Your question already contains the answer:
event.currentTarget
That's the reference to the object that was clicked on.
In my code it would be
mouseEvent.currentTarget
This identifies the object already. It's pointless to look up one of its properties (its name for example) in order to search all the objects for that name, just to identify the same object that you already had to identify (without a name) in order to get the name.
You aren't identifying the objects by name anyway. What differs between the names and what supposedly makes them unique is a number at their end. As pointed out in this answer, this is what's called an index and the thing you are trying to identify with it should go into an array. In my example codes, this is allBoxes.

Get Row Count for Data Transferred using EzAPI SSIS

I am transferring some data from one table to another using SSIS with EzAPI. How can I get the number of rows that were transferred?
My setup is as follows
EzPackage package = new EzPackage();
EzOleDbConnectionManager srcConn;
EzOleDbSource src;
EzOleDbConnectionManager destConn;
EzOleDbDestination dest;
EzDataFlow dataFlow;
destConn = new EzOleDbConnectionManager(package); //set connection string
srcConn = new EzOleDbConnectionManager(package);
dataFlow = new EzDataFlow(package);
src = Activator.CreateInstance(typeof(EzOleDbSource), new object[] { dataFlow }) as EzOleDbSource;
src.Connection = srcConn;
src.SqlCommand = odbcImport.Query;
dest = Activator.CreateInstance(typeof(EzOleDbDestination), new object[] { dataFlow }) as EzOleDbDestination;
dest.Connection = destConn;
dest.AttachTo(src, 0, 0);
dest.AccessMode = AccessMode.AM_OPENROWSET_FASTLOAD;
DTSExecResult result = package.Execute();
Where in this can I add something to get the number of rows? For all versions of SQL server 2008r2 and up
The quick answer is that the Row Count Transformation isn't included out of the box. I had a brief post about that: Row Count with EzAPI
I downloaded the source project from CodePlex and then edited EzComponents.cs (in EzAPI\src) and added the following code
[CompID("{150E6007-7C6A-4CC3-8FF3-FC73783A972E}")]
public class EzRowCountTransform : EzComponent
{
public EzRowCountTransform(EzDataFlow dataFlow) : base(dataFlow) { }
public EzRowCountTransform(EzDataFlow parent, IDTSComponentMetaData100 meta) : base(parent, meta) { }
public string VariableName
{
get { return (string)Meta.CustomPropertyCollection["VariableName"].Value; }
set { Comp.SetComponentProperty("VariableName", value); }
}
}
The component id above is only for 2008.
For 2012, it's going to be E26997D8C-70DA-42B2-8208-A19CE3A9FE41 I don't have a 2012 installation at the moment to confirm I didn't transpose a value there but drop a Row Count component onto a data flow, right click and look at the properties. The component/class id is what that value needs to be. Similar story if you're dealing with 2005.
So, once you have the ability to use EzRowCountTransform, you can simply patch it into your existing script.
// Create an instance of our transform
EzRowCountTransform newRC = null;
// Create a variable to use it
Variable newRCVariable = null;
newRCVariable = package.Variables.Add("RowCountNew", false, "User", 0);
// ...
src.SqlCommand = odbcImport.Query;
// New code here too
newRC = new EzRowCountTransform(dataFlow);
newRC.AttachTo(src);
newRC.Name = "RC New Rows";
newRC.VariableName = newRCVariable.QualifiedName;
// Continue old code
I have a presentation on various approaches I've used over time and what I like/don't like about them. Type more, click less: a programmatic approach to building SSIS. It contains sample code for creating the EzRowCountTransform and usage.

Warning messages with EZAPI EzDerivedColumn and input columns

When adding a derived column to a data flow with ezAPI, I get the following warnings
"Add stuff here.Inputs[Derived Column Input].Columns[ad_zip]" on "Add
stuff here" has usage type READONLY, but is not referenced by an
expression. Remove the column from the list of available input
columns, or reference it in an expression.
I've tried to delete the input columns, but either the method is not working or I'm doing it wrong:
foreach (Microsoft.SqlServer.Dts.Pipeline.Wrapper.IDTSInputColumn100 col in derFull.Meta.InputCollection[0].InputColumnCollection)
{
Console.WriteLine(col.Name);
derFull.DeleteInputColumn(col.Name);
}
I have the following piece of code that fixes the problem.
I got it from a guy called Daniel Otykier. So he is propably the one that should be credited for it... Unlesss he got it from someone else :-)
static public void RemoveUnusedInputColumns(this EzDerivedColumn component)
{
var usedLineageIds = new HashSet<int>();
// Parse all expressions used in new output columns, to determine which input lineage ID's are being used:
foreach (IDTSOutputColumn100 column in component.GetOutputColumns())
{
AddLineageIdsFromExpression(column.CustomPropertyCollection, usedLineageIds);
}
// Parse all expressions in replaced input columns, to determine which input lineage ID's are being used:
foreach (IDTSInputColumn100 column in component.GetInputColumns())
{
AddLineageIdsFromExpression(column.CustomPropertyCollection, usedLineageIds);
}
var inputColumns = component.GetInputColumns();
// Remove all input columns not used in any expressions:
for (var i = inputColumns.Count - 1; i >= 0; i--)
{
if (!usedLineageIds.Contains(inputColumns[i].LineageID))
{
inputColumns.RemoveObjectByIndex(i);
}
}
}
static private void AddLineageIdsFromExpression(IDTSCustomPropertyCollection100 columnProperties, ICollection<int> lineageIds)
{
int lineageId = 1;
var expressionProperty = columnProperties.Cast<IDTSCustomProperty100>().FirstOrDefault(p => p.Name == "Expression");
if (expressionProperty != null)
{
// Input columns used in expressions are always referenced as "#xxx" where xxx is the integer lineage ID.
var expression = expressionProperty.Value.ToString();
var expressionTokens = expression.Split(new[] { ' ', ',', '(', ')' });
foreach (var c in expressionTokens.Where(t => t.Length > 1 && t.StartsWith("#") && int.TryParse(t.Substring(1), out lineageId)))
{
if (!lineageIds.Contains(lineageId)) lineageIds.Add(lineageId);
}
}
}
Simple but not 100% Guaranteed Method
Call ReinitializeMetaData on the base component that EzApi is extending:
dc.Comp.ReinitializeMetaData();
This doesn't always respect some of the customizations and logic checks that EzAPI has, so test it carefully. For most vanilla components, though, this should work fine.
100% Guaranteed Method But Requires A Strategy For Identifying Columns To Ignore
You can set the UsageType property of those VirtualInputColumns to the enumerated value DTSUsageType.UT_IGNORED using EzApi's SetUsageType wrapper method.
But! You have to do this after you're done modifying any of the other metadata of your component (attaching other components, adding new input or output columns, etc.) since each of these triggers the ReinitializeMetaData method on the component, which automatically sets (or resets) all UT_IGNORED VirtualInputColumn's UsageType to UT_READONLY.
So some sample code:
// define EzSourceComponent with SourceColumnToIgnore output column, SomeConnection for destination
EzDerivedColumn dc = new EzDerivedColumn(this);
dc.AttachTo(EzSourceComponent);
dc.Name = "Errors, Go Away";
dc.InsertOutputColumn("NewDerivedColumn");
dc.Expression["NewDerivedColumn"] = "I was inserted!";
// Right here, UsageType is UT_READONLY
Console.WriteLine(dc.VirtualInputCol("SourceColumnToIgnore").UsageType.ToString());
EzOleDbDestination d = new EzOleDbDestination(f);
d.Name = "Destination";
d.Connection = SomeConnection;
d.Table = "dbo.DestinationTable";
d.AccessMode = AccessMode.AM_OPENROWSET_FASTLOAD;
d.AttachTo(dc);
// Now we can set usage type on columns to remove them from the available inputs.
// Note the false boolean at the end.
// That's required to not trigger ReinitializeMetadata for usage type changes.
dc.SetUsageType(0, "SourceColumnToIgnore", DTSUsageType.UT_IGNORED, false);
// Now UsageType is UT_IGNORED and if you saved the package and viewed it,
// you'll see this column has been removed from the available input columns
// ... and the warning for it has gone away!
Console.WriteLine(dc.VirtualInputCol("SourceColumnToIgnore").UsageType.ToString());
I was having exactly your problem and found a way to solve it. The problem is that the EzDerivedColumn has not the PassThrough defined in it's class.
You just need to add this to the class:
private PassThroughIndexer m_passThrough;
public PassThroughIndexer PassThrough
{
get
{
if (m_passThrough == null)
m_passThrough = new PassThroughIndexer(this);
return m_passThrough;
}
}
And alter the ReinitializeMetadataNoCast() to this:
public override void ReinitializeMetaDataNoCast()
{
try
{
if (Meta.InputCollection[0].InputColumnCollection.Count == 0)
{
base.ReinitializeMetaDataNoCast();
LinkAllInputsToOutputs();
return;
}
Dictionary<string, bool> cols = new Dictionary<string, bool>();
foreach (IDTSInputColumn100 c in Meta.InputCollection[0].InputColumnCollection)
cols.Add(c.Name, PassThrough[c.Name]);
base.ReinitializeMetaDataNoCast();
foreach (IDTSInputColumn100 c in Meta.InputCollection[0].InputColumnCollection)
{
if (cols.ContainsKey(c.Name))
SetUsageType(0, c.Name, cols[c.Name] ? DTSUsageType.UT_READONLY : DTSUsageType.UT_IGNORED, false);
else
SetUsageType(0, c.Name, DTSUsageType.UT_IGNORED, false);
}
}
catch { }
}
That is the strategy used by other components. If you want to see all the code you can check my EzApi2016#GitHub. I'm updating the original code from Microsoft to SQL Server 2016.

Custom GTK widget in Vala not working

I'm trying to make a custom GTK widget in Vala, but I'm already failing at the very first basic attempt, so I'd like some help in knowing where I'm going wrong. I feel like I must be missing something painstakingly obvious, but I just can't see it.
I have three files with the following contents:
start.vala:
using Gtk;
namespace WTF
{
MainWindow main_window;
int main(string[] args)
{
Gtk.init(ref args);
main_window = new MainWindow();
Gtk.main();
return 0;
}
}
main_window.vala:
using Gtk;
namespace WTF
{
public class MainWindow : Window
{
public MainWindow()
{
/* */
Entry entry = new Entry();
entry.set_text("Yo!");
this.add(entry);
/* */
/*
CustomWidget cw = new CustomWidget();
this.add(cw);
/* */
this.window_position = WindowPosition.CENTER;
this.set_default_size(400, 200);
this.destroy.connect(Gtk.main_quit);
this.show_all();
}
}
}
custom_widget.vala:
using Gtk;
namespace WTF
{
public class CustomWidget : Bin
{
public CustomWidget()
{
Entry entry = new Entry();
entry.set_text("Yo");
this.add(entry);
this.show_all();
}
}
}
As you can see, in main_window.vala, I have two sets of code. One that adds the Entry widget directly, and one that adds my custom widget. If you run the one that adds the Entry widget directly, you get this result:
If you run the one with the custom widget, however, you get this result:
Just for the record, this is the complication command I use:
valac --pkg gtk+-2.0 start.vala main_window.vala custom_widget.vala -o wtf
EDIT:
Following user4815162342's suggestion, I implemented the size_allocate method on my custom Bin widget, like so:
public override void size_allocate(Gdk.Rectangle r)
{
stdout.printf("Size_allocate: %d,%d ; %d,%d\n", r.x, r.y, r.width, r.height);
Allocation a = Allocation() { x = r.x, y = r.y, width = r.width, height = r.height };
this.set_allocation(a);
stdout.printf("\tHas child: %s\n", this.child != null ? "true" : "false");
if (this.child != null)
{
int border_width = (int)this.border_width;
Gdk.Rectangle cr = Gdk.Rectangle()
{
x = r.x + border_width,
y = r.y + border_width,
width = r.width - 2 * border_width,
height = r.height - 2 * border_width
};
stdout.printf("\tChild size allocate: %d,%d ; %d, %d\n", cr.x, cr.y, cr.width, cr.height);
this.child.size_allocate(cr);
}
}
It writes the following in the console:
Size_allocate: 0,0 ; 400,200
Has child: true
Child size allocate: 0,0 ; 400, 200
And the window renders thusly:
GtkBin is an abstract single-child container, typically intended to decorate the child widget in some way, or change its visibility or size. Without some added value, a single-child container would be indistinguishable from the widget it contains and therefore not very useful.
Since GtkBin doesn't know what kind of decorations you will draw around the child, it expects you to implement your own size_allocate. A simple implementation is available in gtk_event_area_size_allocate, a more complex one in gtk_button_size_allocate.
This answer shows a minimal size_allocate implementation in PyGTK which should be straightforward to port to Vala. If you do anything more complex than that, you will need to also implement expose, and possibly other methods, but this will get you started.

Create a Non-Database-Driven Lookup

Lots of references for creating lookups out there, but all seem to draw their values from a query.
I want to add a lookup to a field that will add items from a list of values that do not come from a table, query, or any other data source.
Such as from a string: "Bananas, Apples, Oranges"
..or a container ["Bananas", "Apples", "Oranges"]
Assume the string/container is a dynamic object. Drawing from an static enum is not a choice.
Is there a way to create lookups on the fly from something other than a data source?
Example code would be a great help, but I'll take hints as well.
There is the color picker.
Also in the Global you will find pickXxxx such as pickList.
There are others, pickUser, pickUserGroup etc.
Take a look on the implementation. I guess they build a temporary table then displays that. Tables are great!
Update:
To go on you own follow the rules.
For the advanced user, see also: Lookup form returning more than one value.
public void lookup()
{
SysTableLookup sysTableLookup;
TmpTableFieldLookup tmpTableFieldLookup;
Enumerator en;
List entitylist = new list(types::String);
entitylist.addend("Banana");
entitylist.addend("Apple");
en = entityList.getEnumerator();
while (en.moveNext())
{
tmpTableFieldLookup.TableName = en.current();
tmpTableFieldLookup.insert();
}
sysTableLookup = SysTableLookup::newParameters(tableNum(tmpTableFieldLookup), this);
sysTableLookup.addLookupfield(fieldNum(TmpTableFieldLookup, TableName));
//BP Deviation documented
sysTableLookup.parmTmpBuffer(tmpTableFieldLookup);
sysTableLookup.performFormLookup();
}
The above code helps in displaying strings as lookup.
I'm also guessing there's no way to perform a lookup without a table. I say that because a lookup is simply a form with one or more datasources that is displayed in a different way.
I've also blogged about this, so you can get some info on how to perform a lookup, even with a temporary table, here:
http://devexpp.blogspot.com.br/2012/02/dynamics-ax-custom-lookup.html
Example from global::PickEnumValue:
static int pickEnumValue(EnumId _enumId, boolean _omitZero = false)
{
Object formRun;
container names;
container values;
int i,value = -1,valueIndex;
str name;
#ResAppl
DictEnum dictEnum = new DictEnum(_enumId);
;
if (!dictEnum)
return -1;
for (i=1;i<=dictEnum.values();i++)
{
value = dictEnum.index2Value(i);
if (!(_omitZero && (value == 0)))
{
names += dictEnum.index2Label(i);
values += value;
}
}
formRun = classfactory.createPicklist();
formRun.init();
formRun.choices(names, #ImageClass);
formRun.caption(dictEnum.label());
formRun.run();
formRun.wait();
name = formRun.choice();
value = formRun.choiceInt();
if (value>=0) // the picklist form returns -1 if a choice has not been made
{
valueIndex = -1;
for (i=1;i<=conLen(names);i++)
{
if (name == conPeek(names,i))
{
valueIndex = i;
break;
}
}
if (valueIndex>=0)
return conPeek(values,valueIndex);
}
return value;
}
It isn't the most graceful solution, but this does work, and it doesn't override or modify any native AX 2012 objects:
Copy the sysLookup form from AX2009 (rename it) and import it into AX 2012.
We'll call mine myLookupFormCopy.
I did a find/replace of "sysLookup" in the XPO file to rename it.
Create this class method:
public static client void lookupList(FormStringControl _formStringControl, List _valueList, str _columnLabel = '')
{
Args args;
FormRun formRun;
;
if (_formStringControl && _valueList && _valueList.typeId() == Types::String)
{
args = new Args(formstr(myLookupFormCopy));
args.parmObject(_valueList);
args.parm(_columnLabel);
formRun = classFactory.formRunClass(args);
_formStringControl.performFormLookup(formRun);
}
}
In the lookup method for your string control, use:
public void lookup()
{
List valueList = new List(Types::String);
;
...build your valueList here...
MyClass::lookupList(this, valueList, "List Title");
super();
}