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GetMouseDragDelta(): also returns the delta on the mouse button released frame. Verify that mouse positions are valid otherwise returns zero. Removed obsolete comment. Tweaked demo. (#2419)

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This commit is contained in:
omar 2019-03-15 15:03:37 +01:00
parent ff03ae503b
commit 857381b9ca
4 changed files with 15 additions and 17 deletions
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2
docs/CHANGELOG.txt
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@ -36,6 +36,8 @@ HOW TO UPDATE?
Breaking Changes:
Other Changes:
- GetMouseDragDelta(): also returns the delta on the mouse button released frame. (#2419)
- GetMouseDragDelta(): verify that mouse positions are valid otherwise returns zero.
- Examples: OpenGL: Added a dummy GL call + comments in ImGui_ImplOpenGL3_Init() to detect uninitialized
GL function loaders early, and help users understand what they are missing. (#2421)

7
imgui.cpp
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@ -4206,7 +4206,7 @@ bool ImGui::IsMousePosValid(const ImVec2* mouse_pos)
return p.x >= MOUSE_INVALID && p.y >= MOUSE_INVALID;
}
// Return the delta from the initial clicking position.
// Return the delta from the initial clicking position while the mouse button is clicked or was just released.
// This is locked and return 0.0f until the mouse moves past a distance threshold at least once.
// NB: This is only valid if IsMousePosValid(). Back-ends in theory should always keep mouse position valid when dragging even outside the client window.
ImVec2 ImGui::GetMouseDragDelta(int button, float lock_threshold)
@ -4215,9 +4215,10 @@ ImVec2 ImGui::GetMouseDragDelta(int button, float lock_threshold)
IM_ASSERT(button >= 0 && button < IM_ARRAYSIZE(g.IO.MouseDown));
if (lock_threshold < 0.0f)
lock_threshold = g.IO.MouseDragThreshold;
if (g.IO.MouseDown[button])
if (g.IO.MouseDown[button] || g.IO.MouseReleased[button])
if (g.IO.MouseDragMaxDistanceSqr[button] >= lock_threshold * lock_threshold)
return g.IO.MousePos - g.IO.MouseClickedPos[button]; // Assume we can only get active with left-mouse button (at the moment).
if (IsMousePosValid(&g.IO.MousePos) && IsMousePosValid(&g.IO.MouseClickedPos[button]))
return g.IO.MousePos - g.IO.MouseClickedPos[button];
return ImVec2(0.0f, 0.0f);
}

2
imgui.h
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@ -662,7 +662,7 @@ namespace ImGui
IMGUI_API bool IsMousePosValid(const ImVec2* mouse_pos = NULL); // by convention we use (-FLT_MAX,-FLT_MAX) to denote that there is no mouse
IMGUI_API ImVec2 GetMousePos(); // shortcut to ImGui::GetIO().MousePos provided by user, to be consistent with other calls
IMGUI_API ImVec2 GetMousePosOnOpeningCurrentPopup(); // retrieve backup of mouse position at the time of opening popup we have BeginPopup() into
IMGUI_API ImVec2 GetMouseDragDelta(int button = 0, float lock_threshold = -1.0f); // return the delta from the initial clicking position. This is locked and return 0.0f until the mouse moves past a distance threshold at least once. If lock_threshold < -1.0f uses io.MouseDraggingThreshold
IMGUI_API ImVec2 GetMouseDragDelta(int button = 0, float lock_threshold = -1.0f); // return the delta from the initial clicking position while the mouse button is pressed or was just released. This is locked and return 0.0f until the mouse moves past a distance threshold at least once. If lock_threshold < -1.0f uses io.MouseDraggingThreshold.
IMGUI_API void ResetMouseDragDelta(int button = 0); //
IMGUI_API ImGuiMouseCursor GetMouseCursor(); // get desired cursor type, reset in ImGui::NewFrame(), this is updated during the frame. valid before Render(). If you use software rendering by setting io.MouseDrawCursor ImGui will render those for you
IMGUI_API void SetMouseCursor(ImGuiMouseCursor type); // set desired cursor type

11
imgui_demo.cpp
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@ -2646,22 +2646,17 @@ static void ShowDemoWindowMisc()
for (int button = 0; button < 3; button++)
ImGui::Text("IsMouseDragging(%d):\n w/ default threshold: %d,\n w/ zero threshold: %d\n w/ large threshold: %d",
button, ImGui::IsMouseDragging(button), ImGui::IsMouseDragging(button, 0.0f), ImGui::IsMouseDragging(button, 20.0f));
ImGui::Button("Drag Me");
if (ImGui::IsItemActive())
{
// Draw a line between the button and the mouse cursor
ImDrawList* draw_list = ImGui::GetWindowDrawList();
draw_list->PushClipRectFullScreen();
draw_list->AddLine(io.MouseClickedPos[0], io.MousePos, ImGui::GetColorU32(ImGuiCol_Button), 4.0f);
draw_list->PopClipRect();
ImGui::GetForegroundDrawList()->AddLine(io.MouseClickedPos[0], io.MousePos, ImGui::GetColorU32(ImGuiCol_Button), 4.0f); // Draw a line between the button and the mouse cursor
// Drag operations gets "unlocked" when the mouse has moved past a certain threshold (the default threshold is stored in io.MouseDragThreshold)
// You can request a lower or higher threshold using the second parameter of IsMouseDragging() and GetMouseDragDelta()
ImVec2 value_raw = ImGui::GetMouseDragDelta(0, 0.0f);
ImVec2 value_with_lock_threshold = ImGui::GetMouseDragDelta(0);
ImVec2 mouse_delta = io.MouseDelta;
ImGui::SameLine(); ImGui::Text("Raw (%.1f, %.1f), WithLockThresold (%.1f, %.1f), MouseDelta (%.1f, %.1f)", value_raw.x, value_raw.y, value_with_lock_threshold.x, value_with_lock_threshold.y, mouse_delta.x, mouse_delta.y);
}
ImGui::Text("GetMouseDragDelta(0):\n w/ default threshold: (%.1f, %.1f),\n w/ zero threshold: (%.1f, %.1f)\nMouseDelta: (%.1f, %.1f)", value_with_lock_threshold.x, value_with_lock_threshold.y, value_raw.x, value_raw.y, mouse_delta.x, mouse_delta.y);
ImGui::TreePop();
}