1 /*
2 GWEN
3 Copyright (c) 2010 Facepunch Studios
4 See license in Gwen.h
5 */
6
7 #include "Gwen/Controls/ScrollBar.h"
8 #include "Gwen/Controls/HorizontalScrollBar.h"
9
10 using namespace Gwen;
11 using namespace Gwen::Controls;
12
GWEN_CONTROL_CONSTRUCTOR(HorizontalScrollBar)13 GWEN_CONTROL_CONSTRUCTOR(HorizontalScrollBar)
14 {
15 m_Bar->SetHorizontal();
16
17 m_ScrollButton[SCROLL_BUTTON_LEFT]->SetDirectionLeft();
18 m_ScrollButton[SCROLL_BUTTON_LEFT]->onPress.Add(this, &HorizontalScrollBar::NudgeLeft);
19
20 m_ScrollButton[SCROLL_BUTTON_RIGHT]->SetDirectionRight();
21 m_ScrollButton[SCROLL_BUTTON_RIGHT]->onPress.Add(this, &HorizontalScrollBar::NudgeRight);
22
23 m_Bar->onDragged.Add(this, &HorizontalScrollBar::OnBarMoved);
24 }
25
Layout(Skin::Base * skin)26 void HorizontalScrollBar::Layout(Skin::Base* skin)
27 {
28 BaseClass::Layout(skin);
29
30 m_ScrollButton[SCROLL_BUTTON_LEFT]->SetWidth(Height());
31 m_ScrollButton[SCROLL_BUTTON_LEFT]->Dock(Pos::Left);
32
33 m_ScrollButton[SCROLL_BUTTON_RIGHT]->SetWidth(Height());
34 m_ScrollButton[SCROLL_BUTTON_RIGHT]->Dock(Pos::Right);
35
36 m_Bar->SetHeight(GetButtonSize());
37 m_Bar->SetPadding(Padding(GetButtonSize(), 0, GetButtonSize(), 0));
38
39 float barWidth = (m_fViewableContentSize / m_fContentSize) * (Width() - (GetButtonSize() * 2));
40
41 if (barWidth < GetButtonSize() * 0.5)
42 barWidth = GetButtonSize() * 0.5;
43
44 m_Bar->SetWidth(barWidth);
45 m_Bar->SetHidden(Width() - (GetButtonSize() * 2) <= barWidth);
46
47 //Based on our last scroll amount, produce a position for the bar
48 if (!m_Bar->IsDepressed())
49 {
50 SetScrolledAmount(GetScrolledAmount(), true);
51 }
52 }
53
NudgeLeft(Base *)54 void HorizontalScrollBar::NudgeLeft(Base* /*control*/)
55 {
56 if (!IsDisabled())
57 SetScrolledAmount(GetScrolledAmount() - GetNudgeAmount(), true);
58 }
59
NudgeRight(Base *)60 void HorizontalScrollBar::NudgeRight(Base* /*control*/)
61 {
62 if (!IsDisabled())
63 SetScrolledAmount(GetScrolledAmount() + GetNudgeAmount(), true);
64 }
65
ScrollToLeft()66 void HorizontalScrollBar::ScrollToLeft()
67 {
68 SetScrolledAmount(0, true);
69 }
ScrollToRight()70 void HorizontalScrollBar::ScrollToRight()
71 {
72 SetScrolledAmount(1, true);
73 }
74
GetNudgeAmount()75 float HorizontalScrollBar::GetNudgeAmount()
76 {
77 if (m_bDepressed)
78 return m_fViewableContentSize / m_fContentSize;
79 else
80 return BaseClass::GetNudgeAmount();
81 }
82
OnMouseClickLeft(int x,int y,bool bDown)83 void HorizontalScrollBar::OnMouseClickLeft(int x, int y, bool bDown)
84 {
85 if (bDown)
86 {
87 m_bDepressed = true;
88 Gwen::MouseFocus = this;
89 }
90 else
91 {
92 Gwen::Point clickPos = CanvasPosToLocal(Gwen::Point(x, y));
93 if (clickPos.x < m_Bar->X())
94 NudgeLeft(this);
95 else if (clickPos.x > m_Bar->X() + m_Bar->Width())
96 NudgeRight(this);
97
98 m_bDepressed = false;
99 Gwen::MouseFocus = NULL;
100 }
101 }
102
CalculateScrolledAmount()103 float HorizontalScrollBar::CalculateScrolledAmount()
104 {
105 return (float)(m_Bar->X() - GetButtonSize()) / (float)(Width() - m_Bar->Width() - (GetButtonSize() * 2));
106 }
107
SetScrolledAmount(float amount,bool forceUpdate)108 bool HorizontalScrollBar::SetScrolledAmount(float amount, bool forceUpdate)
109 {
110 amount = Gwen::Clamp(amount, 0, 1);
111
112 if (!BaseClass::SetScrolledAmount(amount, forceUpdate))
113 return false;
114
115 if (forceUpdate)
116 {
117 int newX = GetButtonSize() + (amount * ((Width() - m_Bar->Width()) - (GetButtonSize() * 2)));
118 m_Bar->MoveTo(newX, m_Bar->Y());
119 }
120
121 return true;
122 }
123
OnBarMoved(Controls::Base * control)124 void HorizontalScrollBar::OnBarMoved(Controls::Base* control)
125 {
126 if (m_Bar->IsDepressed())
127 {
128 SetScrolledAmount(CalculateScrolledAmount(), false);
129 BaseClass::OnBarMoved(control);
130 }
131 else
132 InvalidateParent();
133 }