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In this video, we'll take a look at the main elements

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of the CodeLite IDE or integrated development environment.

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Now integrated development environments are really nice because they allow you to

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build and compile and edit and debug

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and do everything from a comment interface,

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but they can be pretty complicated as well.

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Now the CodeLite IDE is a fairly simple IDE as far as IDEs go.

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If you use Microsoft visual studio or if you use XCode and Eclipse and others,

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they're much more complicated, and they've got a lot more bells and whistles.

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But CodeLite's a great IDE for c++, especially when we're learning.

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So let me go over some of the main elements here.

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When you first start CodeLite,

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you have an interface that looks like this.

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This is the main default interface

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or perspective as it's called in CodeLite.

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Over here on the left, you have the workspace pane,

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which is this little rectangular area right here.

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Here in this large area we've got our editing pane.

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This is where we're going to be editing and typing our source code.

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Then we've got an output pane down at the bottom. And you can see that each one of these has

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a lot of little tabs in there, and I'll break that up. So you can see it a little better.

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So here we've got a workspace tab, an explorer tab and so forth.

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And I'll go over what those do in just a moment.

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Now at the moment, there is no workspace at all.

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So we need to create a workspace.

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And then we need to add projects to that workspace.

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So let's do that. Let's create a new workspace, and we can do it right here.

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We can select new workspace right on the main menu here

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or we could go up to a workspace, new workspace or we could go to file,

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new, new workspace.

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You can choose whichever one you like. I'll choose this one right here.

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And I'll give the workspace a name.

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In this case, I'm going to call it Section 4 because this is

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a video in section 4 and that way we can create all our section for projects

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right within this workspace.

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The path for the workspace you need to provide,

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I'm going to select my cpp

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examples folder, which is on my desktop.

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I'll select that.

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And this will create that workspace within that folder, and I'll select okay.

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Now you can see that we've got a workspace here called Section 4.

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And a couple of other things have popped up here. You can see there's a debug drop down,

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and we'll get to all that in just a bit.

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So at this point, we need to create some projects.

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Notice that there is nothing to edit here in this window.

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It's empty because there are no c++ files ready for editing yet.

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So let's create a project.

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This is going to be very similar to the way we created the projects in the installation videos

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in the previous sections. So I'm going to right click on section 4 workspace,

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and I'm going to say new project.

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At this point, I'm going to select that default project template that we created.

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In this case, I called it Frank default g++ project. So I'm going to select that

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press next.

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And I'm going to give this project a name. I'm just simply going to call it project1.

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I'll select next. I'll accept these defaults, which is my compiler and debugger.

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And I'll select finish.

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So now you can see I've got a project named project1

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under my section 4 workspace,

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and you can see there's the main cpp file.

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If I double click that, it will open up in the editor.

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And it's just going to say hello world.

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We'll get to building and running this in the next video.

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But for now, let's create another project

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because remember, we can have multiple projects in our workspace.

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So I'm going to go back up to my workspace, right click,

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do again new project.

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I'll use the same template, and I'll just call this project2

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and press next and finish.

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Okay. So now you can see that we've got two projects within the workspace.

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Also notice that project1 is italicized and it's bold.

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This tells you that this is the current project or the active project.

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Now I can select the main cpp in project two,

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and you can see here we've got two c++ files.

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One for each project. Now you'll notice that when I select these tabs,

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you'll notice I select this tab and this highlights right here,

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so this tells you that this is the main cpp for project1.

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When I select this tab here on the right,

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this main cpp lights up for project2.

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If you're not getting that behavior,

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then this little link right here is probably not selected.

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If that's unselected, then you'll click on these and this won't change at all on the left side here,

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in the workspace view.

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So you want to make sure that that's selected. That way it links the editor to the workspace file.

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So there we go. We can switch between them very easily.

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So let's change this source code.

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I'm going to select this file right here, and I'm just going to say Hello Project1.

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And I'm going to save it with ctrl s or command s.

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And I'm going to select this guy right here, and I'm going to say hello project2.

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That way we'll be able to see the difference when we run them.

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And again, I'm saving it. We could also do file save.

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That's it.

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Now suppose I want to change between projects.

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So here notice that project one is the active project.

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You can select the active project just by choosing it here from the download list.

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You can see when I when I hover over it it says select the active project.

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So that's as simple as that. You can also double click on the project name.

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So if I double click on project2, project2 is now the active project.

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Project1 is now the active project.

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Now what does active project mean? Well, when I build a project,

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let's say I come up to my build and I say build something, run something,

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clean something, and I'll get to all this in the next video,

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it's going to apply it to the currently active project.

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It's real important because suppose that now you're here

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and you're modifying this source code here. And then you build

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and you see nothing's changed. Well, that's because this project2 is not active.

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Project1 is the active project.

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So when you build and run, it's going to run project1.

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It may seem like this is pretty hard to keep track of, but it's really not.

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It's really easy to keep track of what project is active.

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And using this little link editor, you can obviously see which file you're working on.

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So it's pretty easy to do.

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There's a couple of other things that I wanted to talk about here.In the editor window here,

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you can see that we've got line numbers selected.

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Okay. So that the IDE is displaying line numbers for us.

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This is handy because the compiler errors will give you line numbers

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and it'll also throw you a little error right here it'll show you some red

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a little mark that says hey the error is here, which is kind of nice.

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I'm going to keep the line numbers on for me.

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You can choose to not use them if it distracts you.

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But in the course, I'll refer to line number 7,

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line number 5. That way it's much easier for you to follow along.

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If you want to get rid of those line numbers,

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you could just go up to settings, preferences

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and right under editor, you could see show line numbers in the margin and you could just uncheck that.

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It's a whole bunch of other options.

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The other thing you might notice is

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you'll notice right here to the left of the end there's a little triangle.

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That's called a code folding triangle.

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So if I select that

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you can see what happens is notice I've got active right now lines 3, 4.

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Well, I've got all my lines, right, from 1 to 8.

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But when I select that, it hides lines 4, 5 and 6.

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And you get this horizontal line, showing you that yeah there is stuff in here.

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I'm just hiding it right now. This is called code folding.

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It basically just hides that code.

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This is real handy when you've got hundreds

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and hundreds of lines of code in your file,

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and you're scrolling through trying to find things.

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It's really really nice to be able to just fold some stuff up.

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In other words, I'm working on this function right now I don't need to see all the other ones.

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I just fold them out of the way.

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We'll get to use these features later on as our programs get bigger. But

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if you find yourself in the position where you've clicked on that by accident,

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you see this line and you're thinking oh my goodness where did my source code go,

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don't worry the source code is still there.

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Again, if you see that horizontal line, just

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click on that little triangle and it will show it for you.

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Also notice that the editor uses color coding

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to display certain things. So for example you can see that int

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and return are a purple color.

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And you can also see that hello project2 here is in this dark blue color.

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We've also got things in dark green, light green and so forth,

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also notice that the integer 0 is red. 

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So there's rules that the IDE is using behind the scenes

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to make it easier for you to figure out what's going on.

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So one of the rules is it's saying hey

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you know what if you're seeing a reserve word or one of the keywords in c++

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make them purple.

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You can tweak all of these by going to settings, colors and fonts,

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select c++ here on the left

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and you can customize the font that youwant to use for

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your keywords and so forth.

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I recommend you just leave this alone unless you have a real problem with some of the colors that are there.

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Okay. So that makes it really easy to

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figure out what's going on. So for example, let's say I forgot this

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quote right here.

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You can see that that entire thing is now a dark blue.

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That tells you something's not right. So we can always use that coloring

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to help us out. It's the IDE trying to make life easier for you.

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The output pane down at the bottom,

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this is where our compiler messages will be displayed when we build code.

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You know, it'll tell us what we're building, the status of the build and so forth.

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It'll also be handy for for doing global search and replaces,

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both at the workspace level and at the project level.

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I mean sometimes you want to change a name from hello to hello there.

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And it's really easy to do a global search and replace.

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There's a bunch of other tabs here.

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These tabs we're not going to use most of them.

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I'm basically just going to leave them alone.

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But if they bother you, you want to get rid of them,

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you can click on these three horizontal dots right here.

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These three vertical dots rather right here.

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And you can select to hide certain things. So let's say we don't want to see

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the BuildQ tab.

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Just select BuildQ and it hides it. You can always bring it back if you like.

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Like I said, I'm just going to leave them alone.

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But if you're if your screen real estate is small

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or your monitor is small and you're having trouble you know fitting all this stuff in,

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this is a really easy way to do it.

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The ones we're going to use the most are Build

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and Output and obviously Search and Replace can come in very handy.

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Okay. Now in the workspace view, we've also got some tabs.

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Now here, I'm going to spread this so you can see it a little bit.

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The only ones we're really going to use here are workspace,

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explorer and tabs. These last three tab groups, cmakehelp and wxcrafter,

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we're not really going to use them so what we can do is we can hide those.

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So again, I'll select the three dots,

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and I'll hide wxcrafter, I'll hide cmake,

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and I'll hide tab groups.

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That's it. That makes it a little less cluttered. And it's kind of nice to

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see it all there.

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This little drop down arrow here.

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If I'm in tabs and I select download I can go to workspace.

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If you only have three tabs, that's not really a big deal.

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But if you've got a lot of tabs then it's real nice to be able to

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do that, especially when when they're hidden and you can't see them in a

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situation like this.

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So the last thing I want to do is I want to show you that you can actually move

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these panes around.

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Now this is the default perspective that you get out of the can.

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Some people don't like the workspace view on the left, they prefer it on the right.

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So you could just grab the workspace view tab right here

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and, just move it over, drag it to the right and you'll see it light up.

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You can see here if I wanted to put it down here, it lights up.

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The area that it's going to be in lights up

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again at the top.  You can choose to put it wherever you like.

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Let's say youlike it over here on the right.

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And some people like this workflow a little better.

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So now you've got your workspace here on the right and your editor on the left.

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You can do the same thing with this output view.

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I mean suppose I want to put my output view right under

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my workspace view, I could do that. Now I've got a really large editing area.

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It's totally up to you,

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the perspective that you use. This is a really personal decision.

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I've worked on teams where everybody on the team -- teams of hundreds.

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Everybody's got their own way of doing things. So everybody tweaks the environment their way.

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The nice thing about this is that if

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you download some project and it's got this

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perspective saved, you can always come up to perspective

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and click on default layout and that'll bring it right back to the default.

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So I can just select that and here I am back just back to scratch

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just like you came out of the can.

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If you prefer your layout to be a specific way, let's say, I like it like this and

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I want to move this over just a little bit here.

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And this guy's up here like that.

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Again, however you want to do it, you can come up to perspective

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and then save current layout as.

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So let's just say I want to call this Frank.layout.

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And I can save it.

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So I can switch between the default layout.

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And if I want to go back to my own layout, I can go back to Frank layout.

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Really, really easy to do. There's two layouts that come

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already pre-configured.

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One is the default layout which is the one I've shown you before.

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And the other one is the debug layout. This is the layout that's used when you're doing debugging.

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So if I select debug layout,

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you can see that I've got an output view pane on the left and a debugger pane on the right.

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And CodeLite will switch to this automatically when you go into debug mode.

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Again, if you have a better way of doing it that works for you,

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you can tweak this and save that perspective.

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So I'll switch back to the default perspective.

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And we can also use the view options

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to hide or view

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different panes. So for example if I don't want to see the output pane or the workspace pane,

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I can certainly hide them and view them.

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I can also do that here by closing up

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with that little x right there to close up the workspace view.

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I can also make the workspace view really large by clicking this icon right here.

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So you've got all these options. And I encourage you to play around with the environment

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and set it up to a place where you feel comfortable working.

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Recall, we talked about this in one of the installation videos

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that we can show a toolbar.

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So we can build and run and save and have all kinds of options

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by just clicking on these toolbar icons.

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I'm not going to use that since it really clutters things up for me.

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And I want to be able to explain exactly what I'm doing.

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So for example that icon right there says run active project.

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That one says start or continue debugger.

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So they can be confusing at first. I'm not going to use those. I'm simply going to come up here and

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tell you exactly what I'm doing.

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So I'm going to close the toolbar down but again feel free to use it.

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And that wraps up this quick tour of the CodeLite IDE.

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We are certainly going to use more features as the course progresses.

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In the next video, we'll create our first c++ program

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that goes a little bit beyond the hello world program.

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And we'll use that program to understand how the build process works within

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the CodeLite IDE.