127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//=============================================================================//
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#include "DemoPage.h"
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#include <VGUI/IVGui.h>
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#include <vgui/IScheme.h>
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#include <vgui_controls/ScrollBar.h>
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#include <vgui_controls/Label.h>
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#include <stdio.h>
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using namespace vgui;
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//-----------------------------------------------------------------------------
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// A ScrollBar is an class for selecting a numerical value from a range.
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// E.g. in the case of a scrolling text window we use the scroll bar to select
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// what line/char of text display should start at in the text window.
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// Some terms:
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//
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// There are arrow buttons on either end of the scroll bar.
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// These move the scroll bar 'slider' or 'nob' across the space between the arrows.
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// The nob moves over a user specified 'range' of numbers.
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//
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// ----------------------------------------------------
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// | / |..............| |................ | \ |
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// | \ |..............| nob |.................| / |
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// ----------------------------------------------------
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//
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// In this demo we create a vertical scroll bar that is not attached to anything.
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// We display the current value of the slider nob next to the scroll bar.
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//-----------------------------------------------------------------------------
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class ScrollBarDemo: public DemoPage
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{
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public:
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ScrollBarDemo(Panel *parent, const char *name);
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~ScrollBarDemo();
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void OnSliderMoved();
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private:
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ScrollBar *m_pScrollbar;
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Label *m_pScrollValue;
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DECLARE_PANELMAP();
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};
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//-----------------------------------------------------------------------------
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// Purpose: Constructor
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//-----------------------------------------------------------------------------
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ScrollBarDemo::ScrollBarDemo(Panel *parent, const char *name) : DemoPage(parent, name)
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{
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// A vertical slider
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m_pScrollbar = new ScrollBar (this, "ASscrollbar", true);
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// Set the position of the bar
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m_pScrollbar->SetPos(100, 100);
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// Set the size of the bar
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m_pScrollbar->SetSize (20, 200);
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// Set the size of the bar nob, which is actually proportionally
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// related to how many lines of info fit into the window the
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// scroll bar is attatched to vs how many total lines there are.
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// With a size of 10, the scroll bar value will pass from 0 to 100.
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m_pScrollbar->SetRangeWindow(10);
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// Set the range of the bar,
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// We want our range displayed to go from 0 to 100.
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// We must take size of the bar nob into account, and set the max to 110.
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m_pScrollbar->SetRange(0, 110);
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// Set how far the scroll bar slider moves
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// when a scroll bar arrow button is pressed
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m_pScrollbar->SetButtonPressedScrollValue(5);
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// Set the starting value of the bar nob.
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// This will put the nob at the top of the vertical scroll bar.
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m_pScrollbar->SetValue(0);
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// Finally we create a little label to tell us what the current value
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// of the scroll bar is.
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// We will update it every time the slider is moved.
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m_pScrollValue = new Label (this, "ScrollBarValue", "0");
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// Stick the label next to the scroll bar.
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m_pScrollValue->SetPos(130, 100);
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}
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//-----------------------------------------------------------------------------
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// Purpose: Destructor
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//-----------------------------------------------------------------------------
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ScrollBarDemo::~ScrollBarDemo()
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{
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}
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//-----------------------------------------------------------------------------
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// Purpose: Respond to movement of the scroll bar nob by updating the label's
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// text with the current value of the scrollbar.
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//-----------------------------------------------------------------------------
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void ScrollBarDemo::OnSliderMoved()
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{
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char number[6];
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sprintf (number, "%d", m_pScrollbar->GetValue());
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m_pScrollValue->SetText(number);
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}
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//-----------------------------------------------------------------------------
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// Purpose: Message map
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//-----------------------------------------------------------------------------
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MessageMapItem_t ScrollBarDemo::m_MessageMap[] =
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{
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MAP_MESSAGE( ScrollBarDemo, "ScrollBarSliderMoved", OnSliderMoved ),
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};
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IMPLEMENT_PANELMAP(ScrollBarDemo, Panel);
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Panel* ScrollBarDemo_Create(Panel *parent)
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{
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return new ScrollBarDemo(parent, "ScrollBarDemo");
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}
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