Switch the default button based on the target control.

This currently works by actually having two different controls for each button.

diskbrowser.c

@@ -44,6 +44,9 @@ char finderRequestName[] = "\pApple~Finder~";
 #define disksList 1007
 #define mountDiskButton 1008
 
+#define searchButtonDefault (searchButton+50)
+#define mountDiskButtonDefault (mountDiskButton+50)
+
 #define searchErrorAlert 3000
 
 Word resourceFileID;
@@ -55,6 +58,12 @@ Word myUserID;
 
 GrafPortPtr window;
 
+CtlRecHndl disksListHandle;
+CtlRecHndl mountButtonHandle, mountButtonDefaultHandle;
+CtlRecHndl searchButtonHandle, searchButtonDefaultHandle;
+
+unsigned long lastTargetCtlID = 0;
+
 Boolean resourceFileOpened, windowOpened;
 
 /* User preference */
@@ -336,29 +345,34 @@ void DoSearch(void) {
     }
     processArray(docs, json_object, processDoc);
     
-    for (int i = 0; i < DISK_LIST_LENGTH; i++) {
+    diskList[0].memFlag = 0x80;
+    for (int i = 1; i < DISK_LIST_LENGTH; i++) {
         diskList[i].memFlag = 0;
     }
 
     /* Update state of controls once disk list is available */
-    CtlRecHndl disksListHandle = GetCtlHandleFromID(window, disksList);
     HiliteControl(noHilite, disksListHandle);
-    NewList2(NULL, 1, (Ref) diskList, refIsPointer, 
-             diskListPos, (Handle)disksListHandle);
-
     SetCtlMoreFlags(
         GetCtlMoreFlags(disksListHandle) | fCtlCanBeTarget | fCtlWantEvents,
         disksListHandle);
-    HiliteCtlByID(noHilite, window, mountDiskButton);
     
+    NewList2(NULL, 1, (Ref) diskList, refIsPointer, 
+             diskListPos, (Handle)disksListHandle);
+
+    if (diskListPos > 0) {
+        if (FindTargetCtl() != disksListHandle) {
+            MakeThisCtlTarget(disksListHandle);
+            CallCtlDefProc(disksListHandle, ctlChangeTarget, 0);
+        }
+    }
+
     free(searchURL);
     EndTCPConnection(&sess);
     InitCursor();
     return;
 
 errorReturn:
-    NewList2(NULL, 1, (Ref) diskList, refIsPointer, 
-             0, (Handle)GetCtlHandleFromID(window, disksList));
+    NewList2(NULL, 1, (Ref) diskList, refIsPointer, 0, (Handle)disksListHandle);
     free(queryString);
     free(searchURL);
     EndTCPConnection(&sess);
@@ -372,6 +386,7 @@ void HandleEvent(int eventCode, WmTaskRec *taskRec) {
     case wInControl:
         switch (taskRec->wmTaskData4) {
         case searchButton:
+        case searchButtonDefault:
             DoSearch();
             break;
         
@@ -383,6 +398,7 @@ void HandleEvent(int eventCode, WmTaskRec *taskRec) {
             break;
 
         case mountDiskButton:
+        case mountDiskButtonDefault:
             // TODO
             break;
         }
@@ -406,6 +422,36 @@ void HandleEvent(int eventCode, WmTaskRec *taskRec) {
         }
         break;
     }
+
+    unsigned long targetCtlID = GetCtlID(FindTargetCtl());
+    if (targetCtlID != lastTargetCtlID) {
+        /* Make button corresponding to target control the default */
+        lastTargetCtlID = targetCtlID;
+        if (targetCtlID == searchLine) {
+            SetCtlMoreFlags(GetCtlMoreFlags(mountButtonDefaultHandle) & 0x1FFF,
+                            mountButtonDefaultHandle);
+            SetCtlMoreFlags(GetCtlMoreFlags(searchButtonDefaultHandle) | 0x3000,
+                            searchButtonDefaultHandle);
+            ShowControl(searchButtonDefaultHandle);
+            HideControl(mountButtonDefaultHandle);
+        } else if (targetCtlID == disksList) {
+            SetCtlMoreFlags(GetCtlMoreFlags(searchButtonDefaultHandle) & 0x1FFF,
+                            searchButtonDefaultHandle);
+            SetCtlMoreFlags(GetCtlMoreFlags(mountButtonDefaultHandle) | 0x3000,
+                            mountButtonDefaultHandle);
+            ShowControl(mountButtonDefaultHandle);
+            HideControl(searchButtonDefaultHandle);
+        }
+    }
+
+    /* Only allow "Mount Disk" to be clicked if there is a disk selected */
+    if (NextMember2(0, (Handle)disksListHandle) != 0) {
+        HiliteControl(noHilite, mountButtonHandle);
+        HiliteControl(noHilite, mountButtonDefaultHandle);
+    } else {
+        HiliteControl(inactiveHilite, mountButtonHandle);
+        HiliteControl(inactiveHilite, mountButtonDefaultHandle);
+    }
 }
 
 /* NDA-style action routine for our window */
@@ -493,8 +539,19 @@ void ShowBrowserWindow(void) {
     sysWindRecord.memoryID = myUserID;
     auxWindInfo->NDASysWindPtr = (Ptr)&sysWindRecord;
     
-    HiliteCtlByID(inactiveHilite, window, disksList);
-    HiliteCtlByID(inactiveHilite, window, mountDiskButton);
+    disksListHandle = GetCtlHandleFromID(window, disksList);
+    mountButtonDefaultHandle = GetCtlHandleFromID(window, mountDiskButtonDefault);
+    searchButtonDefaultHandle = GetCtlHandleFromID(window, searchButtonDefault);
+    mountButtonHandle = GetCtlHandleFromID(window, mountDiskButton);
+    searchButtonHandle = GetCtlHandleFromID(window, searchButton);
+    
+    HideControl(GetCtlHandleFromID(window, mountDiskButtonDefault));
+    
+    HiliteControl(inactiveHilite, disksListHandle);
+    HiliteControl(inactiveHilite, mountButtonHandle);
+    HiliteControl(inactiveHilite, mountButtonDefaultHandle);
+    
+    lastTargetCtlID = 0;
 
 cleanup:
     if (resourceFileOpened && !windowOpened) {

diskbrowser.rez

@@ -10,6 +10,9 @@
 #define disksList 1007
 #define mountDiskButton 1008
 
+#define searchButtonDefault (searchButton+50)
+#define mountDiskButtonDefault (mountDiskButton+50)
+
 resource rWindParam1 (winDiskBrowser) {
     fTitle+fClose+fFlex+fMove+fVis,     /* wFrameBits */
     nil,                                /* wTitle */
@@ -30,12 +33,14 @@ resource rWindParam1 (winDiskBrowser) {
 };
 
 resource rControlList (winDiskBrowser) {{
+    mountDiskButtonDefault,
     mountDiskButton,
     disksList,
     findDisksForText,
     forIIGSRadio,
     forAnyAppleIIRadio,
     searchLine,
+    searchButtonDefault,
     searchButton
 }};
 
@@ -54,8 +59,8 @@ resource rControlTemplate (searchLine) {
 resource rPString (searchLine) { "" };
 
 
-resource rControlTemplate (searchButton) {
-    searchButton,
+resource rControlTemplate (searchButtonDefault) {
+    searchButtonDefault,
     {10, 309, 0, 0},
     SimpleButtonControl {{
         DefaultButton,
@@ -67,6 +72,19 @@ resource rControlTemplate (searchButton) {
     }};
 };
 
+resource rControlTemplate (searchButton) {
+    searchButton,
+    {10, 309, 0, 0},
+    SimpleButtonControl {{
+        0,
+        $1000+RefIsResource,
+        0,
+        searchButton,
+        0,                              /* color table ref */
+        {"","",0,0}                     /* key equivalent = Return */
+    }};
+};
+
 resource rPString(searchButton) { "Find Disks" };
 
 
@@ -142,6 +160,19 @@ resource rControlTemplate (mountDiskButton) {
     }};
 };
 
+resource rControlTemplate (mountDiskButtonDefault) {
+    mountDiskButtonDefault,
+    {152, 305, 0, 0},
+    SimpleButtonControl {{
+        DefaultButton,
+        $3000+RefIsResource,
+        0,
+        mountDiskButton,
+        0,                              /* color table ref */
+        {"\$0D","\$0D",0,0}             /* key equivalent */
+    }};
+};
+
 resource rPString(mountDiskButton) { "Mount Disk" };