added random ROM loading option (resolves #995)

Changes.txt

@@ -20,6 +20,8 @@
 
   * Added searching by filename for ROM launcher images.
 
+  * Added option to start random ROM.
+
   * Enhanced Game Properties dialog for multigame ROMs.
 
   * Added 2nd UI theme and hotkey for toggling UI theme.

docs/index.html

@@ -2172,6 +2172,12 @@
       <td>Control + R</td>
 	  <td>-</td>
     </tr>
+    <tr>
+      <td>Load random ROM</td>
+      <td>Control-Alt + R</td>
+      <td>Control-Alt + R</td>
+	  <td>-</td>
+    </tr>
     <tr>
       <td>Open Options dialog</td>
       <td>Control + O</td>
@@ -4232,6 +4238,9 @@
     </li><li>
     <img src="graphics/open_help.png" style="vertical-align: middle; margin-top: 4px; margin-bottom: 4px; margin-right: 4px">
       Open this help for the launcher.
+	</li><li>
+	<img src="graphics/reload_list.png" style="vertical-align: middle; margin-top: 4px; margin-bottom: 4px; margin-right: 4px">
+	  Reload the file list.
     </li><li>
       The 'Filter' text box can be used to narrow down the results in the
       ROM listing. When this box is empty, all files are shown. Typing
@@ -4246,7 +4255,10 @@
     </li><li>
     <img src="graphics/show_current_dir.png" style="vertical-align: middle; margin-top: 4px; margin-bottom: 4px">
     <img src="graphics/show_sub_dirs.png" style="vertical-align: middle; margin-top: 4px; margin-bottom: 4px; margin-right: 4px">
-      Display either files from current directory only or all subdirectories too.
+      Display either files from current directory only, or all subdirectories too.
+    </li><li>
+    <img src="graphics/select_random_rom.png" style="vertical-align: middle; margin-top: 4px; margin-bottom: 4px; margin-right: 4px">
+      Load a random ROM from the current file list.
     </li>
   </ul>
   </br>

src/gui/Icons.hxx

@@ -27,7 +27,9 @@ namespace GUI {
 
 /* Exported structure definition. */
 static constexpr IconDesc iconSmallDesc(14, 14);
+static constexpr IconDesc iconSmallWDesc(24, 14);
 static constexpr IconDesc iconLargeDesc(19, 20);
+static constexpr IconDesc iconLargeWDesc(32, 20);
 
 // Settings icon
 static const Icon icon_settings_small(
@@ -149,44 +151,6 @@ static const Icon icon_reload_small(
     0b00000111110000
   });
 
-// Allfiles icons
-static const Icon icon_onlyroms_small_on (
-  iconSmallDesc,
-  {
-    0b00000000000000,
-    0b00000111100000,
-    0b00000111100000,
-    0b00000111100000,
-    0b00000111100000,
-    0b00000111100000,
-    0b00000111100000,
-    0b00001111110000,
-    0b00001111110000,
-    0b00011111111000,
-    0b00011011011000,
-    0b00110011001100,
-    0b11110011001111,
-    0b11100011000111
-  });
-static const Icon icon_onlyroms_small_off (
-  iconSmallDesc,
-  {
-    0b01111111111000,
-    0b01000000001100,
-    0b01000000000110,
-    0b01000000000010,
-    0b01001000010010,
-    0b01001100110010,
-    0b01000111100010,
-    0b01011111111010,
-    0b01000111100010,
-    0b01001100110010,
-    0b01001000010010,
-    0b01000000000010,
-    0b01000000000010,
-    0b01111111111110
-  });
-
 // Subdirs icons
 static const Icon icon_subdirs_small_off(
   iconSmallDesc,
@@ -224,6 +188,27 @@ static const Icon icon_subdirs_small_on(
     0b00001000000001,
     0b00001111111111
   });
+
+// random ROM icon
+static const Icon icon_random_small(
+  iconSmallWDesc,
+  {
+    0b100000000000000000000100,
+    0b110000000000000000000110,
+    0b111000000011100000011111,
+    0b111100000011110000111111,
+    0b111110000000011001100110,
+    0b111111000000001100000100,
+    0b111111100000000110000000,
+    0b111111100000000110000000,
+    0b111111000000000011000100,
+    0b111110000000011001100110,
+    0b111100000011110000111111,
+    0b111000000011100000011111,
+    0b110000000000000000000110,
+    0b100000000000000000000100
+  });
+
 // Help icon
 static const Icon icon_help_small(
   iconSmallDesc,
@@ -401,55 +386,6 @@ static const Icon icon_reload_large(
     0b0000001111111000000
   });
 
-// Allfiles icons
-static const Icon icon_onlyroms_large_on(
-  iconLargeDesc,
-  {
-    0b00000000000000000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000001011010000000,
-    0b00000011011011000000,
-    0b00000011011011000000,
-    0b00000111011011100000,
-    0b00000110011001100000,
-    0b00001110011001110000,
-    0b00011100011000111000,
-    0b01111100011000011110,
-    0b11111000011000001111,
-    0b11100000011000000111
-  });
-static const Icon icon_onlyroms_large_off(
-  iconLargeDesc,
-  {
-    0b0111111111111100000,
-    0b0100000000000110000,
-    0b0100000000000011000,
-    0b0100000000000001100,
-    0b0100011000011000100,
-    0b0100011100111000100,
-    0b0100001100110000100,
-    0b0100001111110000100,
-    0b0100000111100000100,
-    0b0101111111111110100,
-    0b0101111111111110100,
-    0b0100000111100000100,
-    0b0100001111110000100,
-    0b0100001100110000100,
-    0b0100011100111000100,
-    0b0100011000011000100,
-    0b0100000000000000100,
-    0b0100000000000000100,
-    0b0100000000000000100,
-    0b0111111111111111100
-  });
 
 // Subdirs icons
 static const Icon icon_subdirs_large_off(
@@ -501,6 +437,31 @@ static const Icon icon_subdirs_large_on(
     0b0000111111111111111
   });
 
+static const Icon icon_random_large(
+  iconLargeWDesc,
+  {
+    0b00000000000000000000000000001100,
+    0b10000000000000000000000000001110,
+    0b11000000000001111000000001111111,
+    0b11100000000001111100000011111111,
+    0b11110000000001111110000111001110,
+    0b11111000000000000111000110001100,
+    0b11111100000000000011100000001000,
+    0b11111110000000000001110000000000,
+    0b11111111000000000001110000000000,
+    0b11111111100000000000111000000000,
+    0b11111111100000000000011100000000,
+    0b11111111000000000000011100001000,
+    0b11111110000000000110001110001100,
+    0b11111100000001111110000111001110,
+    0b11111000000001111100000011111111,
+    0b11110000000001111000000001111111,
+    0b11100000000000000000000000001110,
+    0b11000000000000000000000000001100,
+    0b10000000000000000000000000001000,
+    0b00000000000000000000000000001000,
+  });
+
 static const Icon icon_help_large(
   iconLargeDesc,
   {

src/gui/LauncherDialog.cxx

@@ -61,6 +61,7 @@
 #include "Version.hxx"
 #include "MediaFactory.hxx"
 #include "LauncherDialog.hxx"
+#include "Random.hxx"
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 LauncherDialog::LauncherDialog(OSystem& osystem, DialogContainer& parent,
@@ -129,10 +130,12 @@ void LauncherDialog::addFilteringWidgets(int& ypos)
 
     // Figure out general icon button size
     const GUI::Icon& reloadIcon = smallIcon ? GUI::icon_reload_small : GUI::icon_reload_large;
+    const GUI::Icon& randomIcon = smallIcon ? GUI::icon_random_small : GUI::icon_random_large;
     const GUI::Icon& dummyIcon = reloadIcon;  //-- used for sizing all the other icons
     const int iconWidth = dummyIcon.width();
     const int iconGap = ((fontWidth + 1) & ~0b1) + 1; // round up to next even
     const int iconButtonWidth = iconWidth + iconGap;
+    const int randomButtonWidth = randomIcon.width() + iconGap;
 
     int xpos = HBORDER;
 
@@ -151,8 +154,8 @@ void LauncherDialog::addFilteringWidgets(int& ypos)
     int fwFilter = EditTextWidget::calcWidth(_font, "123456"); // at least 6 chars
 
     // Calculate how much space everything will take
-    int wTotal = xpos + (iconButtonWidth * 3) + lwFilter + fwFilter + lwFound + bwSettings
+    int wTotal = xpos + (iconButtonWidth * 2) + randomButtonWidth + lwFilter + fwFilter + lwFound + bwSettings
-      + LBL_GAP * 6 + btnGap * 2 + HBORDER;
+      + LBL_GAP * 5 + btnGap * 3 + HBORDER;
 
     // make sure there is space for at least 6 characters in the filter field
     if(_w < wTotal)
@@ -175,7 +178,7 @@ void LauncherDialog::addFilteringWidgets(int& ypos)
     // Show the reload button
     myReloadButton = new ButtonWidget(this, _font, xpos, ypos - btnYOfs,
                                       iconButtonWidth, buttonHeight, reloadIcon, kReloadCmd);
-    myReloadButton->setToolTip("Reload listing. (Ctrl+R)");
+    myReloadButton->setToolTip("Reload listing (Ctrl+R)");
     wid.push_back(myReloadButton);
     xpos = myReloadButton->getRight() + LBL_GAP * 2;
 
@@ -203,13 +206,20 @@ void LauncherDialog::addFilteringWidgets(int& ypos)
     // Show the files counter
     myRomCount = new StaticTextWidget(this, _font, xpos, ypos,
                                       lwFound, fontHeight, "", TextAlign::Right);
+    xpos = myRomCount->getRight() + LBL_GAP;
+
+    // Show the random ROM button
+    myRandomRomButton = new ButtonWidget(this, _font, xpos, ypos - btnYOfs,
+                                         randomButtonWidth, buttonHeight, randomIcon, kLoadRndRomCmd);
+    myRandomRomButton->setToolTip("Load random ROM (Ctrl-Alt+R)");
+    wid.push_back(myRandomRomButton);
 
     // Show the Settings / Options button (positioned from the right)
     xpos = _w - HBORDER - bwSettings;
     mySettingsButton = new ButtonWidget(this, _font, xpos, ypos - btnYOfs,
                                         iconWidth, buttonHeight, settingsIcon,
                                         iconGap, lblSettings, kOptionsCmd);
-    mySettingsButton-> setToolTip("(Ctrl+O)");
+    mySettingsButton-> setToolTip("Open Options dialog (Ctrl+O)");
     wid.push_back(mySettingsButton);
 
     ypos = mySettingsButton->getBottom() + Dialog::vGap();
@@ -821,6 +831,9 @@ void LauncherDialog::handleKeyDown(StellaKey key, StellaMod mod, bool repeated)
         break;
 
       case KBDK_R:
+        if(StellaModTest::isAlt(mod))
+          loadRandomRom();
+        else
           reload();
         break;
 
@@ -993,6 +1006,10 @@ void LauncherDialog::handleCommand(CommandSender* sender, int cmd,
       loadRom();
       break;
 
+    case kLoadRndRomCmd:
+      loadRandomRom();
+      break;
+
     case kOptionsCmd:
       openSettings();
       break;
@@ -1227,6 +1244,19 @@ void LauncherDialog::openContextMenu(int x, int y)
   contextMenu().show(x + getAbsX(), y + getAbsY(), surface().dstRect(), 0);
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void LauncherDialog::loadRandomRom()
+{
+  const Random rand;
+  int tries = 100; // limit to 100 tries, in case the directory contains no ROMs
+
+  do {
+    myList->setSelected(rand.next() % myList->getList().size());
+  } while(myList->isDirectory(myList->selected()) && --tries);
+  if(tries)
+    loadRom();
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void LauncherDialog::openSettings()
 {

src/gui/LauncherDialog.hxx

@@ -149,6 +149,7 @@ class LauncherDialog : public Dialog, CommandSender
     void loadRom();
     void loadRomInfo();
     void loadPendingRomInfo();
+    void loadRandomRom();
     void openSettings();
     void openGameProperties();
     void openContextMenu(int x = -1, int y = -1);
@@ -178,6 +179,7 @@ class LauncherDialog : public Dialog, CommandSender
     ButtonWidget*     mySettingsButton{nullptr};
     EditTextWidget*   myPattern{nullptr};
     ButtonWidget*     mySubDirsButton{nullptr};
+    ButtonWidget*     myRandomRomButton{nullptr};
     StaticTextWidget* myRomCount{nullptr};
     ButtonWidget*     myHelpButton{nullptr};
 
@@ -211,6 +213,7 @@ class LauncherDialog : public Dialog, CommandSender
 
     enum {
       kSubDirsCmd    = 'lred',
+      kLoadRndRomCmd = 'lrnd',  // load random ROM
       kOptionsCmd    = 'OPTI',
       kQuitCmd       = 'QUIT',
       kReloadCmd     = 'relc',

src/gui/RomInfoWidget.cxx

@@ -166,11 +166,13 @@ void RomInfoWidget::parseProperties(const FSNode& node, bool full)
                           + (isPlusCart ? " - PlusROM" : "")
                           + buf.str());
     }
+#ifdef DEBUG_BUILD
     // Debug bezel properties:
-    //if(myProperties.get(PropType::Bezel_Name).empty())
+    if(myProperties.get(PropType::Bezel_Name).empty())
-    //  myRomInfo.push_back("*Bezel: " + Bezel::getName(instance().bezelDir().getPath(), myProperties));
+      myRomInfo.push_back("*Bezel: " + Bezel::getName(instance().bezelDir().getPath(), myProperties));
-    //else
+    else
-    //  myRomInfo.push_back(" Bezel: " + myProperties.get(PropType::Bezel_Name));
+      myRomInfo.push_back(" Bezel: " + myProperties.get(PropType::Bezel_Name));
+#endif
   }
 
   setDirty();