Misc tidying up (zero-clear structures, more unused default in ClipRetFullscreen, NavApplyItemToResult() coding style fix)

Zero-clearing more structures
Remove arbitrary default ClipRetFullscreen value in ImDrawListSharedData.
Nav extracted NavApplyItemToResult() function.
Coding style fixes in OSX Backends.

examples/example_apple_metal/main.mm

@@ -1,3 +1,6 @@
+// Dear ImGui: standalone example application for OSX + Metal.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 #import <Foundation/Foundation.h>
 
@@ -31,13 +34,15 @@
 
 @implementation ViewController
 
-- (instancetype)initWithNibName:(nullable NSString *)nibNameOrNil bundle:(nullable NSBundle *)nibBundleOrNil {
+- (instancetype)initWithNibName:(nullable NSString *)nibNameOrNil bundle:(nullable NSBundle *)nibBundleOrNil 
+{
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
     
     _device = MTLCreateSystemDefaultDevice();
     _commandQueue = [_device newCommandQueue];
 
-    if (!self.device) {
+    if (!self.device) 
+    {
         NSLog(@"Metal is not supported");
         abort();
     }
@@ -75,11 +80,13 @@
     return self;
 }
 
-- (MTKView *)mtkView {
+- (MTKView *)mtkView 
+{
     return (MTKView *)self.view;
 }
 
-- (void)loadView {
+- (void)loadView 
+{
     self.view = [[MTKView alloc] initWithFrame:CGRectMake(0, 0, 1200, 720)];
 }
 
@@ -104,14 +111,13 @@
     // window, we'd want to be much more careful than just ingesting the complete event stream, though we
     // do make an effort to be good citizens by passing along events when Dear ImGui doesn't want to capture.
     NSEventMask eventMask = NSEventMaskKeyDown | NSEventMaskKeyUp | NSEventMaskFlagsChanged | NSEventTypeScrollWheel;
-    [NSEvent addLocalMonitorForEventsMatchingMask:eventMask handler:^NSEvent * _Nullable(NSEvent *event) {
+    [NSEvent addLocalMonitorForEventsMatchingMask:eventMask handler:^NSEvent * _Nullable(NSEvent *event)
+    {
         BOOL wantsCapture = ImGui_ImplOSX_HandleEvent(event, self.view);
-        if (event.type == NSEventTypeKeyDown && wantsCapture) {
+        if (event.type == NSEventTypeKeyDown && wantsCapture)
             return nil;
-        } else {
+        else
             return event;
-        }
-
     }];
 
     ImGui_ImplOSX_Init();
@@ -174,15 +180,18 @@
 // multitouch correctly at all. This causes the "cursor" to behave very erratically
 // when there are multiple active touches. But for demo purposes, single-touch
 // interaction actually works surprisingly well.
-- (void)updateIOWithTouchEvent:(UIEvent *)event {
+- (void)updateIOWithTouchEvent:(UIEvent *)event
+{
     UITouch *anyTouch = event.allTouches.anyObject;
     CGPoint touchLocation = [anyTouch locationInView:self.view];
     ImGuiIO &io = ImGui::GetIO();
     io.MousePos = ImVec2(touchLocation.x, touchLocation.y);
 
     BOOL hasActiveTouch = NO;
-    for (UITouch *touch in event.allTouches) {
-        if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled) {
+    for (UITouch *touch in event.allTouches)
+    {
+        if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled)
+        {
             hasActiveTouch = YES;
             break;
         }
@@ -190,19 +199,23 @@
     io.MouseDown[0] = hasActiveTouch;
 }
 
-- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
+{
     [self updateIOWithTouchEvent:event];
 }
 
-- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
+{
     [self updateIOWithTouchEvent:event];
 }
 
-- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
+{
     [self updateIOWithTouchEvent:event];
 }
 
-- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
+{
     [self updateIOWithTouchEvent:event];
 }
 
@@ -288,8 +301,8 @@
 
         // Rendering
         ImGui::Render();
-        ImDrawData* drawData = ImGui::GetDrawData();
-        ImGui_ImplMetal_RenderDrawData(drawData, commandBuffer, renderEncoder);
+        ImDrawData* draw_data = ImGui::GetDrawData();
+        ImGui_ImplMetal_RenderDrawData(draw_data, commandBuffer, renderEncoder);
 
         [renderEncoder popDebugGroup];
         [renderEncoder endEncoding];
@@ -316,8 +329,10 @@
 
 @implementation AppDelegate
 
-- (instancetype)init {
-    if (self = [super init]) {
+- (instancetype)init
+{
+    if (self = [super init])
+    {
         NSViewController *rootViewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
         self.window = [[NSWindow alloc] initWithContentRect:NSZeroRect
                                                   styleMask:NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskResizable | NSWindowStyleMaskMiniaturizable
@@ -331,7 +346,8 @@
     return self;
 }
 
-- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {
+- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender
+{
     return YES;
 }
 
@@ -363,14 +379,17 @@
 
 #if TARGET_OS_OSX
 
-int main(int argc, const char * argv[]) {
+int main(int argc, const char * argv[])
+{
     return NSApplicationMain(argc, argv);
 }
 
 #else
 
-int main(int argc, char * argv[]) {
-    @autoreleasepool {
+int main(int argc, char * argv[])
+{
+    @autoreleasepool
+    {
         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
     }
 }

examples/example_apple_opengl2/main.mm

@@ -139,7 +139,7 @@
     animationTimer = nil;
 }
 
-// Forward Mouse/Keyboard events to dear imgui OSX backend. It returns true when imgui is expecting to use the event.
+// Forward Mouse/Keyboard events to Dear ImGui OSX backend.
 -(void)keyUp:(NSEvent *)event               { ImGui_ImplOSX_HandleEvent(event, self); }
 -(void)keyDown:(NSEvent *)event             { ImGui_ImplOSX_HandleEvent(event, self); }
 -(void)flagsChanged:(NSEvent *)event        { ImGui_ImplOSX_HandleEvent(event, self); }

imgui.cpp

@@ -862,6 +862,7 @@ static float            NavUpdatePageUpPageDown();
 static inline void      NavUpdateAnyRequestFlag();
 static void             NavEndFrame();
 static bool             NavScoreItem(ImGuiNavMoveResult* result, ImRect cand);
+static void             NavApplyItemToResult(ImGuiNavMoveResult* result, ImGuiWindow* window, ImGuiID id, const ImRect& nav_bb_rel);
 static void             NavProcessItem(ImGuiWindow* window, const ImRect& nav_bb, ImGuiID id);
 static ImVec2           NavCalcPreferredRefPos();
 static void             NavSaveLastChildNavWindowIntoParent(ImGuiWindow* nav_window);
@@ -8377,6 +8378,14 @@ static bool ImGui::NavScoreItem(ImGuiNavMoveResult* result, ImRect cand)
     return new_best;
 }
 
+static void ImGui::NavApplyItemToResult(ImGuiNavMoveResult* result, ImGuiWindow* window, ImGuiID id, const ImRect& nav_bb_rel)
+{
+    result->Window = window;
+    result->ID = id;
+    result->FocusScopeId = window->DC.NavFocusScopeIdCurrent;
+    result->RectRel = nav_bb_rel;
+}
+
 // We get there when either NavId == id, or when g.NavAnyRequest is set (which is updated by NavUpdateAnyRequestFlag above)
 static void ImGui::NavProcessItem(ImGuiWindow* window, const ImRect& nav_bb, const ImGuiID id)
 {
@@ -8417,25 +8426,14 @@ static void ImGui::NavProcessItem(ImGuiWindow* window, const ImRect& nav_bb, con
         bool new_best = g.NavMoveRequest && NavScoreItem(result, nav_bb);
 #endif
         if (new_best)
-        {
-            result->Window = window;
-            result->ID = id;
-            result->FocusScopeId = window->DC.NavFocusScopeIdCurrent;
-            result->RectRel = nav_bb_rel;
-        }
+            NavApplyItemToResult(result, window, id, nav_bb_rel);
 
         // Features like PageUp/PageDown need to maintain a separate score for the visible set of items.
         const float VISIBLE_RATIO = 0.70f;
         if ((g.NavMoveRequestFlags & ImGuiNavMoveFlags_AlsoScoreVisibleSet) && window->ClipRect.Overlaps(nav_bb))
             if (ImClamp(nav_bb.Max.y, window->ClipRect.Min.y, window->ClipRect.Max.y) - ImClamp(nav_bb.Min.y, window->ClipRect.Min.y, window->ClipRect.Max.y) >= (nav_bb.Max.y - nav_bb.Min.y) * VISIBLE_RATIO)
                 if (NavScoreItem(&g.NavMoveResultLocalVisibleSet, nav_bb))
-                {
-                    result = &g.NavMoveResultLocalVisibleSet;
-                    result->Window = window;
-                    result->ID = id;
-                    result->FocusScopeId = window->DC.NavFocusScopeIdCurrent;
-                    result->RectRel = nav_bb_rel;
-                }
+                    NavApplyItemToResult(&g.NavMoveResultLocalVisibleSet, window, id, nav_bb_rel);
     }
 
     // Update window-relative bounding box of navigated item

imgui_draw.cpp

@@ -344,21 +344,12 @@ void ImGui::StyleColorsLight(ImGuiStyle* dst)
 
 ImDrawListSharedData::ImDrawListSharedData()
 {
-    Font = NULL;
-    FontSize = 0.0f;
-    CurveTessellationTol = 0.0f;
-    CircleSegmentMaxError = 0.0f;
-    ClipRectFullscreen = ImVec4(-8192.0f, -8192.0f, +8192.0f, +8192.0f);
-    InitialFlags = ImDrawListFlags_None;
-
-    // Lookup tables
+    memset(this, 0, sizeof(*this));
     for (int i = 0; i < IM_ARRAYSIZE(ArcFastVtx); i++)
     {
         const float a = ((float)i * 2 * IM_PI) / (float)IM_ARRAYSIZE(ArcFastVtx);
         ArcFastVtx[i] = ImVec2(ImCos(a), ImSin(a));
     }
-    memset(CircleSegmentCounts, 0, sizeof(CircleSegmentCounts)); // This will be set by SetCircleSegmentMaxError()
-    TexUvLines = NULL;
 }
 
 void ImDrawListSharedData::SetCircleSegmentMaxError(float max_error)

imgui_internal.h

@@ -844,7 +844,7 @@ struct IMGUI_API ImGuiMenuColumns
     float       Width, NextWidth;
     float       Pos[3], NextWidths[3];
 
-    ImGuiMenuColumns();
+    ImGuiMenuColumns() { memset(this, 0, sizeof(*this)); }
     void        Update(int count, float spacing, bool clear);
     float       DeclColumns(float w0, float w1, float w2);
     float       CalcExtraSpace(float avail_w) const;
@@ -897,7 +897,7 @@ struct ImGuiPopupData
     ImVec2              OpenPopupPos;   // Set on OpenPopup(), preferred popup position (typically == OpenMousePos when using mouse)
     ImVec2              OpenMousePos;   // Set on OpenPopup(), copy of mouse position at the time of opening popup
 
-    ImGuiPopupData() { PopupId = 0; Window = SourceWindow = NULL; OpenFrameCount = -1; OpenParentId = 0; }
+    ImGuiPopupData()    { memset(this, 0, sizeof(*this)); OpenFrameCount = -1; }
 };
 
 struct ImGuiNavMoveResult
@@ -1006,7 +1006,7 @@ struct ImGuiColumnData
     ImGuiColumnsFlags   Flags;              // Not exposed
     ImRect              ClipRect;
 
-    ImGuiColumnData()   { OffsetNorm = OffsetNormBeforeResize = 0.0f; Flags = ImGuiColumnsFlags_None; }
+    ImGuiColumnData()   { memset(this, 0, sizeof(*this)); }
 };
 
 struct ImGuiColumns
@@ -1027,21 +1027,7 @@ struct ImGuiColumns
     ImVector<ImGuiColumnData> Columns;
     ImDrawListSplitter  Splitter;
 
-    ImGuiColumns()      { Clear(); }
-    void Clear()
-    {
-        ID = 0;
-        Flags = ImGuiColumnsFlags_None;
-        IsFirstFrame = false;
-        IsBeingResized = false;
-        Current = 0;
-        Count = 1;
-        OffMinX = OffMaxX = 0.0f;
-        LineMinY = LineMaxY = 0.0f;
-        HostCursorPosY = 0.0f;
-        HostCursorMaxPosX = 0.0f;
-        Columns.clear();
-    }
+    ImGuiColumns()      { memset(this, 0, sizeof(*this)); }
 };
 
 //-----------------------------------------------------------------------------
@@ -1083,7 +1069,7 @@ struct ImGuiWindowSettings
     bool        Collapsed;
     bool        WantApply;      // Set when loaded from .ini data (to enable merging/loading .ini data into an already running context)
 
-    ImGuiWindowSettings()       { ID = 0; Pos = Size = ImVec2ih(0, 0); Collapsed = WantApply = false; }
+    ImGuiWindowSettings()       { memset(this, 0, sizeof(*this)); }
     char* GetName()             { return (char*)(this + 1); }
 };
 

imgui_widgets.cpp

@@ -6388,13 +6388,6 @@ void ImGui::Value(const char* prefix, float v, const char* float_format)
 //-------------------------------------------------------------------------
 
 // Helpers for internal use
-ImGuiMenuColumns::ImGuiMenuColumns()
-{
-    Spacing = Width = NextWidth = 0.0f;
-    memset(Pos, 0, sizeof(Pos));
-    memset(NextWidths, 0, sizeof(NextWidths));
-}
-
 void ImGuiMenuColumns::Update(int count, float spacing, bool clear)
 {
     IM_ASSERT(count == IM_ARRAYSIZE(Pos));