Tree expand/collapse issue in NatTable(0.9->1.0)

I was facing tree expand/collapse issue in NatTable after migrating from 0.9 to 1.0 version.  I could not even expand or collapse a tree after migration, it was disabled completely so we can’t even see the children of a tree.

This can be resolved by configuring CellPainterMouseEventMatcher with GridRegion.BODY  instead of  TreeLayer.TREE_COLUMN_CELL

If you are facing the same issue, this would be useful tip.

ToolTip information on NatTable cells

Default implementation is provided by ‘DefaultToolTip’ class from Jface, so we can override getText() method to provide tool tip information based on the specific criteria.

Example below:



import java.util.Properties;

import org.eclipse.jface.window.DefaultToolTip;
import org.eclipse.jface.window.ToolTip;
import org.eclipse.nebula.widgets.nattable.NatTable;
import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;


public class MyXToolTip extends DefaultToolTip {

private NatTable natTable;
private XSpanningDataProvider bodyDataProvider;


public MyXToolTip (NatTable natTable, XSpanningDataProvider bodyDataProvider) {
super(natTable, ToolTip.NO_RECREATE, false);
this.natTable = natTable;
this.bodyDataProvider = bodyDataProvider;
}


protected Object getToolTipArea(Event event) {
int col = natTable.getColumnPositionByX(event.x);
int row = natTable.getRowPositionByY(event.y);

//if any specific implementation here ex: You want to display tooltip information only on first column. if(col != 0) return;

return new Point(col, row);
}

protected String getText(Event event) {
int col = natTable.getColumnPositionByX(event.x);
int row = natTable.getRowPositionByY(event.y);

ILayerCell cell = natTable.getCellByPosition(col, row);
INode rowObject = bodyDataProvider.getRowObject(cell.getRowIndex()); //my INode Object which has specific cell information
String channelName = rowObject.getName();

//If any specific implementation here, ex: mixing column and row information
return channelName;
}

protected Composite createToolTipContentArea(Event event, Composite parent) {
// This is where you could get really creative with your tooltips...
return super.createToolTipContentArea(event, parent);
}
}

Eclipse NatTable: How do you render Checkbox, Image and Text in a single cell

Say, below is your requirement. I am showing only part of the complete dialog below.

I am talking here about first column,rending check box and windows 8 image and followed by display text.

Do the following:
Use a TextPainter, decorate it (CellPainterDecorator) with an ImagePainter, use the resulting painter as base painter of another decorator and decorate it with a CheckboxPainter


//Text painter to diplay text
TextPainter textPainter = new TextPainter() {
//Any specific implementation
};


//My image painter
 class MyImagePainter extends ImagePainter {

private MyData data = null
public MyImagePainter(MyData data) {
this.data = data; //this would be useful, what image has to displayed on call.
}

@Override
protected Image getImage(ILayerCell cell, IConfigRegistry configRegistry) {
//return specific image on data object and it's properties.
return null;
}
 }

//Cell painter decorator for image and text
CellPainterDecorator cellPainterDecorator = new CellPainterDecorator(
textPainter, //text painter
CellEdgeEnum.LEFT, //Image should left side of Text
new MyImagePainter(bodyDataProvider)); //Image Painter
 
//Wrapper for cellPainterDecorator  and checkbox
configRegistry.registerConfigAttribute(
CellConfigAttributes.CELL_PAINTER,
new CellPainterWrapper(new BackgroundPainter(
new CellPainterDecorator(
cellPainterDecorator, //decorator to render image and text
CellEdgeEnum.LEFT, // check box has to be displayed left hand side of the cell.
myCheckBoxPainter)), // check box painter
10),
DisplayMode.NORMAL,
TreeLayer.TREE_COLUMN_CELL);

registerEditing(configRegistry, TreeLayer.TREE_COLUMN_CELL);

Maintaining clear git history tree

This is what I have learned from my colleague few days back.

My general workflow with git:
 Git pull origin Dev-5.0
 Then I would have worked for a day or two
 Now, I want to push my changes for last 2 days. But, in mean time many people in my team also would have pushed the code.
 Git commit  “last 2 days commits message”
 Git pull origin Dev-5.0 -> get the latest code from server again
 Git push origin Dev-5.0 -> push your committed changes to the server


But, this is creating a very bad hierarchy tree in git(gitk). Like below

The problem here is, while I am committing my code I don't have the latest code from central repository. This would create a different tree hierarchy in git from my last state, and only when I push my code it will merge your local branch with the central repository. Then it will connect your local branch tree node to the central tree node.

Below is the approach which has worked out for us.

 Git pull origin Dev-5.0

 Then you might be working for few days

 Now you want to commit your changes.

 Git stash   -> stash your current changes in local repository

 Git pull origin Dev-5.0   -> Get the latest changes from the central repository

 Now your local repository has latest changes

 Apply your stashed changes on latest changes which we have pulled from central repository.

 Git stash pop -> This will apply stashed changes to current changes.

 If any merge conflicts, resolve them

 Git commit  “my changes”

 Git push origin Dev-5.0    => This would fail, if somebody else has pushed the code in mean time after your last pull, so we need to pull the code again and proceed with the push.

This is how it looks, if we maintain the above procedure.

How to replace recursive functions using stack and while-loop

http://www.codeproject.com/Articles/418776/How-to-replace-recursive-functions-using-stack-and

Companies which are working on Eclipse related development

Companies which are working on Eclipse Plug-in development related work.

Hyderabad:
IBM ISL -Many products they have on Eclipse- Rational rose, myEclipse, OpenStack development
Kony Labs - KonyOne IDE
Pramati - Pramati servers which are based on OSGI
Progress Software - Many products which are based on Eclipse
ModelN - Enterprise modeling tools
Xilinx Inc - Embeded/chip modeling tools/Programmable logic development
Rockwell Collins - Aircraft solutions
Oracle
..very few!!!

Bangalore:
IBM ISL
SAP Labs - BO IDT, HANA Studio, BRM/BPM Tool
Mercedes Benz Research Lab
Robert Bosch
..many more!!!

Design thinking

http://realizingempathy.com/

2 years back, I have attended the session from the founders of "Realizing Empathy" Org on "Design Thinking". It was really amazing!!, they gave a lot of insight on Design thinking.

It's a new way of thinking to build a great products with innovative ideas.

With Design Thinking you organize your creative thoughts with empathy, communication, optimism, experimentation and collaboration. You put the persons and all their needs in the centre when analysing a problem and looking for a solution. You have a challenge, and this challenge is based on 3 things: people, technology and business. You need to be careful and look for results that can be meaningful for the people, technically feasible and economically viable.