game-engine/GUI.cpp at master · LucaDavidian/game-engine · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
#include "GUI.h"
#include "GUISystem.h"

void FocusGUIVisitor::Visit(GUIPanel *component)
{
	if (component->IsInside(x, y))
		mFocusedComponent = component;
}

void FocusGUIVisitor::Visit(GUIButton *component)
{
	if (component->IsInside(x, y))
		mFocusedComponent = component;
}

void FocusGUIVisitor::Visit(GUITextField *component)
{
	if (component->IsInside(x, y))
		mFocusedComponent = component;
}

GUI::GUI(GUIComponent *root) : mRoot(root)
{
	// register with GUI system
	GUISystem::GetInstance().AddGUI(this);
}

GUI::~GUI()
{
	delete mRoot;
}

void GUI::OnMouseMove(int x, int y)
{
	static int previousX = x;
	static int previousY = y;

	FocusGUIVisitor v(x, y);
	mRoot->AcceptPreorder(v);
	GUIComponent *focusedComponent = v.GetFocusedComponent();

	if (focusedComponent != mFocusedComponent)  // focus has changed
	{
		if (mSelectedComponent)
		{
			if (focusedComponent == mSelectedComponent)
				mSelectedComponent->OnMouseEnter();

			if (mFocusedComponent == mSelectedComponent)
				mSelectedComponent->OnMouseLeave();

			mFocusedComponent = focusedComponent;
		}
		else  // if no component is selected
		{
			if (mFocusedComponent)
				mFocusedComponent->OnMouseLeave();

			mFocusedComponent = focusedComponent;

			if (mFocusedComponent)
				mFocusedComponent->OnMouseEnter();
		}
	}

	if (mSelectedComponent)
		mSelectedComponent->OnMouseMove(x - previousX, y - previousY);

	previousX = x;
	previousY = y;
}

void GUI::OnMousePress(int x, int y)
{
	if (mFocusedComponent)
	{
		if (mSelectedComponent && mFocusedComponent != mSelectedComponent)
			mSelectedComponent->OnMousePress();

		mSelectedComponent = mFocusedComponent;
		mSelectedComponent->OnMousePress();
	}
}

void GUI::OnMouseRelease(int x, int y)
{
	if (mSelectedComponent)
	{
		mSelectedComponent->OnMouseRelease();

		if (!mSelectedComponent->IsSelected())
		{
			mSelectedComponent = nullptr;

			if (mFocusedComponent)
				mFocusedComponent->OnMouseEnter();
		}
	}
}

void GUI::OnKeyPress(int key)
{
	if (mSelectedComponent)
		mSelectedComponent->OnKeyPress(key);
}