Rename PointerState.isDown as per style guide (#23120)

Renames from isDown to is_down in accordance with the C++ style guide.

lib/ui/window/pointer_data_packet_converter.cc

@@ -54,7 +54,7 @@ void PointerDataPacketConverter::ConvertPointerData(
         auto iter = states_.find(pointer_data.device);
         if (iter != states_.end()) {
           PointerState state = iter->second;
-          FML_DCHECK(state.isDown);
+          FML_DCHECK(state.is_down);
           UpdatePointerIdentifier(pointer_data, state, false);
 
           if (LocationNeedsUpdate(pointer_data, state)) {
@@ -67,7 +67,7 @@ void PointerDataPacketConverter::ConvertPointerData(
             converted_pointers.push_back(synthesized_move_event);
           }
 
-          state.isDown = false;
+          state.is_down = false;
           states_[pointer_data.device] = state;
           converted_pointers.push_back(pointer_data);
         }
@@ -85,14 +85,14 @@ void PointerDataPacketConverter::ConvertPointerData(
         FML_DCHECK(iter != states_.end());
         PointerState state = iter->second;
 
-        if (state.isDown) {
+        if (state.is_down) {
           // Synthesizes cancel event if the pointer is down.
           PointerData synthesized_cancel_event = pointer_data;
           synthesized_cancel_event.change = PointerData::Change::kCancel;
           synthesized_cancel_event.synthesized = 1;
           UpdatePointerIdentifier(synthesized_cancel_event, state, false);
 
-          state.isDown = false;
+          state.is_down = false;
           states_[synthesized_cancel_event.device] = state;
           converted_pointers.push_back(synthesized_cancel_event);
         }
@@ -126,7 +126,7 @@ void PointerDataPacketConverter::ConvertPointerData(
           state = iter->second;
         }
 
-        FML_DCHECK(!state.isDown);
+        FML_DCHECK(!state.is_down);
         state.buttons = pointer_data.buttons;
         if (LocationNeedsUpdate(pointer_data, state)) {
           UpdateDeltaAndState(pointer_data, state);
@@ -149,7 +149,7 @@ void PointerDataPacketConverter::ConvertPointerData(
           state = iter->second;
         }
 
-        FML_DCHECK(!state.isDown);
+        FML_DCHECK(!state.is_down);
         if (LocationNeedsUpdate(pointer_data, state)) {
           // Synthesizes a hover event if the location does not match.
           PointerData synthesized_hover_event = pointer_data;
@@ -162,7 +162,7 @@ void PointerDataPacketConverter::ConvertPointerData(
         }
 
         UpdatePointerIdentifier(pointer_data, state, true);
-        state.isDown = true;
+        state.is_down = true;
         state.buttons = pointer_data.buttons;
         states_[pointer_data.device] = state;
         converted_pointers.push_back(pointer_data);
@@ -173,7 +173,7 @@ void PointerDataPacketConverter::ConvertPointerData(
         auto iter = states_.find(pointer_data.device);
         FML_DCHECK(iter != states_.end());
         PointerState state = iter->second;
-        FML_DCHECK(state.isDown);
+        FML_DCHECK(state.is_down);
 
         UpdatePointerIdentifier(pointer_data, state, false);
         UpdateDeltaAndState(pointer_data, state);
@@ -186,7 +186,7 @@ void PointerDataPacketConverter::ConvertPointerData(
         auto iter = states_.find(pointer_data.device);
         FML_DCHECK(iter != states_.end());
         PointerState state = iter->second;
-        FML_DCHECK(state.isDown);
+        FML_DCHECK(state.is_down);
 
         UpdatePointerIdentifier(pointer_data, state, false);
 
@@ -201,7 +201,7 @@ void PointerDataPacketConverter::ConvertPointerData(
           converted_pointers.push_back(synthesized_move_event);
         }
 
-        state.isDown = false;
+        state.is_down = false;
         state.buttons = pointer_data.buttons;
         states_[pointer_data.device] = state;
         converted_pointers.push_back(pointer_data);
@@ -221,7 +221,7 @@ void PointerDataPacketConverter::ConvertPointerData(
 
         PointerState state = iter->second;
         if (LocationNeedsUpdate(pointer_data, state)) {
-          if (state.isDown) {
+          if (state.is_down) {
             // Synthesizes a move event if the pointer is down.
             PointerData synthesized_move_event = pointer_data;
             synthesized_move_event.signal_kind = PointerData::SignalKind::kNone;
@@ -260,7 +260,7 @@ PointerState PointerDataPacketConverter::EnsurePointerState(
     PointerData pointer_data) {
   PointerState state;
   state.pointer_identifier = 0;
-  state.isDown = false;
+  state.is_down = false;
   state.physical_x = pointer_data.physical_x;
   state.physical_y = pointer_data.physical_y;
   states_[pointer_data.device] = state;

lib/ui/window/pointer_data_packet_converter.h

@@ -29,7 +29,7 @@ namespace flutter {
 ///
 struct PointerState {
   int64_t pointer_identifier;
-  bool isDown;
+  bool is_down;
   double physical_x;
   double physical_y;
   int64_t buttons;