Line data    Source code

       1             : /* Copyright (C) 2022 Wildfire Games.
       2             :  * This file is part of 0 A.D.
       3             :  *
       4             :  * 0 A.D. is free software: you can redistribute it and/or modify
       5             :  * it under the terms of the GNU General Public License as published by
       6             :  * the Free Software Foundation, either version 2 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * 0 A.D. is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :  * GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License
      15             :  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
      16             :  */
      17             : 
      18             : #include "precompiled.h"
      19             : 
      20             : #include "CSlider.h"
      21             : 
      22             : #include "gui/CGUI.h"
      23             : #include "maths/MathUtil.h"
      24             : 
      25           1 : const CStr CSlider::EventNameValueChange = "ValueChange";
      26             : 
      27           0 : CSlider::CSlider(CGUI& pGUI)
      28             :     : IGUIObject(pGUI),
      29             :       IGUIButtonBehavior(*static_cast<IGUIObject*>(this)),
      30             :       m_ButtonSide(this, "button_width"),
      31             :       m_MaxValue(this, "max_value"),
      32             :       m_MinValue(this, "min_value"),
      33             :       m_Sprite(this, "sprite"),
      34             :       m_SpriteDisabled(this, "sprite_disabled"),
      35             :       m_SpriteBar(this, "sprite_bar"),
      36             :       m_SpriteBarDisabled(this, "sprite_bar_disabled"),
      37           0 :       m_Value(this, "value")
      38             : {
      39           0 :     m_Value.Set(Clamp<float>(m_Value, m_MinValue, m_MaxValue), false);
      40           0 : }
      41             : 
      42           0 : CSlider::~CSlider()
      43             : {
      44           0 : }
      45             : 
      46           0 : void CSlider::ResetStates()
      47             : {
      48           0 :     IGUIObject::ResetStates();
      49           0 :     IGUIButtonBehavior::ResetStates();
      50           0 : }
      51             : 
      52           0 : float CSlider::GetSliderRatio() const
      53             : {
      54           0 :     return (m_MaxValue - m_MinValue) / (m_CachedActualSize.GetWidth() - m_ButtonSide);
      55             : }
      56             : 
      57           0 : void CSlider::IncrementallyChangeValue(const float difference)
      58             : {
      59           0 :     m_Value.Set(Clamp<float>(m_Value + difference, m_MinValue, m_MaxValue), true);
      60           0 :     UpdateValue();
      61           0 : }
      62             : 
      63           0 : void CSlider::HandleMessage(SGUIMessage& Message)
      64             : {
      65           0 :     IGUIObject::HandleMessage(Message);
      66           0 :     IGUIButtonBehavior::HandleMessage(Message);
      67             : 
      68           0 :     switch (Message.type)
      69             :     {
      70             :     /*
      71             :     case GUIM_SETTINGS_UPDATED:
      72             :     {
      73             :         m_Value.Set(Clamp<float>(m_Value, m_MinValue, m_MaxValue), true);
      74             :         break;
      75             :     }
      76             :     */
      77           0 :     case GUIM_MOUSE_WHEEL_DOWN:
      78             :     {
      79           0 :         if (m_Pressed)
      80           0 :             break;
      81           0 :         IncrementallyChangeValue(-0.01f);
      82           0 :         break;
      83             :     }
      84           0 :     case GUIM_MOUSE_WHEEL_UP:
      85             :     {
      86           0 :         if (m_Pressed)
      87           0 :             break;
      88           0 :         IncrementallyChangeValue(0.01f);
      89           0 :         break;
      90             :     }
      91           0 :     case GUIM_MOUSE_PRESS_LEFT:
      92             :         FALLTHROUGH;
      93             :     case GUIM_MOUSE_MOTION:
      94             :     {
      95           0 :         if (m_Pressed)
      96             :         {
      97           0 :             m_Mouse = m_pGUI.GetMousePos();
      98           0 :             IncrementallyChangeValue((m_Mouse.X - GetButtonRect().CenterPoint().X) * GetSliderRatio());
      99             :         }
     100           0 :         break;
     101             :     }
     102           0 :     default:
     103           0 :         break;
     104             :     }
     105           0 : }
     106             : 
     107           0 : void CSlider::Draw(CCanvas2D& canvas)
     108             : {
     109           0 :     CRect sliderLine(m_CachedActualSize);
     110           0 :     sliderLine.left += m_ButtonSide / 2.0f;
     111           0 :     sliderLine.right -= m_ButtonSide / 2.0f;
     112           0 :     m_pGUI.DrawSprite(IsEnabled() ? m_SpriteBar : m_SpriteBarDisabled, canvas, sliderLine);
     113           0 :     m_pGUI.DrawSprite(IsEnabled() ? m_Sprite : m_SpriteDisabled, canvas, GetButtonRect());
     114           0 : }
     115             : 
     116           0 : void CSlider::UpdateValue()
     117             : {
     118           0 :     ScriptEvent(EventNameValueChange);
     119           0 : }
     120             : 
     121           0 : CRect CSlider::GetButtonRect() const
     122             : {
     123             :     // Even if the value is incorrect it doesn't make sense to draw it outside
     124             :     // of the element bounds. Because that value might be set intentionally in the
     125             :     // config for debug purposes.
     126           0 :     const float value = Clamp<float>(m_Value, m_MinValue, m_MaxValue);
     127           0 :     float ratio = m_MaxValue > m_MinValue ? (value - m_MinValue) / (m_MaxValue - m_MinValue) : 0.0f;
     128           0 :     float x = m_CachedActualSize.left + ratio * (m_CachedActualSize.GetWidth() - m_ButtonSide);
     129           0 :     float y = m_CachedActualSize.top + (m_CachedActualSize.GetHeight() - m_ButtonSide) / 2.0;
     130           0 :     return CRect(x, y, x + m_ButtonSide, y + m_ButtonSide);
     131           3 : }