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Added SetScrollY(), SetScrollFromPosY(). Renamed SetScrollPosHere() to SetScrollFromCursorPos(). (#150)

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This commit is contained in:
ocornut 2015-07-02 20:53:45 -06:00
parent b54cb1c24c
commit 4eba6cd470
2 changed files with 43 additions and 24 deletions
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58
imgui.cpp
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@ -136,7 +136,8 @@
Occasionally introducing changes that are breaking the API. The breakage are generally minor and easy to fix.
Here is a change-log of API breaking changes, if you are using one of the functions listed, expect to have to fix some code.
- 2015/07/01 (1.42) - renamed GetScrollPosY() to GetScrollY(). Necessary to reduce confusion along with other scrolling functions, because positions (e.g. cursor position) are not equivalent to scrolling amount.
- 2015/07/02 (1.42) - renamed SetScrollPosHere() to SetScrollFromCursorPos(). Kept inline redirection function (will obsolete).
- 2015/07/02 (1.42) - renamed GetScrollPosY() to GetScrollY(). Necessary to reduce confusion along with other scrolling functions, because positions (e.g. cursor position) are not equivalent to scrolling amount.
- 2015/06/14 (1.41) - changed ImageButton() default bg_col parameter from (0,0,0,1) (black) to (0,0,0,0) (transparent) - makes a difference when texture have transparence
- 2015/06/14 (1.41) - changed Selectable() API from (label, selected, size) to (label, selected, flags, size). Size override should have been rarely be used. Sorry!
- 2015/05/31 (1.40) - renamed GetWindowCollapsed() to IsWindowCollapsed() for consistency. Kept inline redirection function (will obsolete).
@ -339,7 +340,6 @@
- window: resizing from any sides? + mouse cursor directives for app.
- window: get size/pos helpers given names (see discussion in #249)
- scrolling: add horizontal scroll
!- scrolling: set scrolling given a position.
!- scrolling: allow immediately effective change of scroll if we haven't appended items yet
- widgets: display mode: widget-label, label-widget (aligned on column or using fixed size), label-newline-tab-widget etc.
- widgets: clean up widgets internal toward exposing everything.
@ -1419,7 +1419,7 @@ struct ImGuiWindow
ImVec2 WindowPadding; // Window padding at the time of begin. We need to lock it, in particular manipulation of the ShowBorder would have an effect
ImGuiID MoveID; // == window->GetID("#MOVE")
float ScrollY;
float ScrollTargetRelY; // target scroll position. stored as cursor position with scrolling canceled out, so the highest point is always 0.0f. (-1.0f for no change)
float ScrollTargetRelY; // target scroll position. stored as cursor position with scrolling canceled out, so the highest point is always 0.0f. (FLT_MAX for no change)
float ScrollTargetCenterRatioY; // 0.0f = scroll so that target position is at top, 0.5f = scroll so that target position is centered
bool ScrollbarY;
bool Active; // Set to true on Begin()
@ -1786,7 +1786,7 @@ ImGuiWindow::ImGuiWindow(const char* name)
SizeContents = ImVec2(0.0f, 0.0f);
WindowPadding = ImVec2(0.0f, 0.0f);
ScrollY = 0.0f;
ScrollTargetRelY = -1.0f;
ScrollTargetRelY = FLT_MAX;
ScrollTargetCenterRatioY = 0.5f;
ScrollbarY = false;
Active = WasActive = false;
@ -3858,11 +3858,11 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
window->FocusIdxAllRequestNext = window->FocusIdxTabRequestNext = IM_INT_MAX;
// Apply scrolling
if (window->ScrollTargetRelY >= 0.0f)
if (window->ScrollTargetRelY < FLT_MAX)
{
float center_ratio_y = window->ScrollTargetCenterRatioY;
window->ScrollY = window->ScrollTargetRelY - ((1.0f - center_ratio_y) * window->TitleBarHeight()) - (center_ratio_y * window->SizeFull.y);
window->ScrollTargetRelY = -1.0f;
window->ScrollTargetRelY = FLT_MAX;
}
window->ScrollY = ImMax(window->ScrollY, 0.0f);
if (!window->Collapsed && !window->SkipItems)
@ -4505,8 +4505,7 @@ bool ImGui::IsRootWindowOrAnyChildFocused()
float ImGui::GetWindowWidth()
{
ImGuiState& g = *GImGui;
ImGuiWindow* window = g.CurrentWindow;
ImGuiWindow* window = GImGui->CurrentWindow;
return window->Size.x;
}
@ -4828,19 +4827,31 @@ float ImGui::GetScrollMaxY()
return window->SizeContents.y - window->SizeFull.y;
}
void ImGui::SetScrollPosHere(float center_y_ratio)
void ImGui::SetScrollY(float scroll_y)
{
ImGuiWindow* window = GetCurrentWindow();
window->ScrollTargetRelY = scroll_y + window->TitleBarHeight(); // title bar height cancelled out when using ScrollTargetRelY
window->ScrollTargetCenterRatioY = 0.0f;
}
void ImGui::SetScrollFromPosY(float pos_y, float center_y_ratio)
{
// We store a target position so centering can occur on the next frame when we are guaranteed to have a known window size
ImGuiState& g = *GImGui;
IM_ASSERT(center_y_ratio >= 0.0f && center_y_ratio <= 1.0f);
ImGuiWindow* window = GetCurrentWindow();
window->ScrollTargetRelY = (float)(int)(window->ScrollY + window->DC.CursorPosPrevLine.y - window->Pos.y + (window->DC.PrevLineHeight) * center_y_ratio);
window->ScrollTargetRelY += g.Style.ItemSpacing.y * (center_y_ratio - 0.5f) * 2.0f;
IM_ASSERT(center_y_ratio >= 0.0f && center_y_ratio <= 1.0f);
window->ScrollTargetRelY = (float)(int)(pos_y + window->ScrollY);
if (center_y_ratio <= 0.0f && window->ScrollTargetRelY <= window->WindowPadding.y) // Minor hack to make "scroll to top" take account of WindowPadding, else it would scroll to (WindowPadding.y - ItemSpacing.y)
window->ScrollTargetRelY = 0.0f;
window->ScrollTargetCenterRatioY = center_y_ratio;
}
void ImGui::SetScrollFromCursorPos(float center_y_ratio)
{
ImGuiWindow* window = GetCurrentWindow();
float target_y = window->DC.CursorPosPrevLine.y + (window->DC.PrevLineHeight * center_y_ratio) + (GImGui->Style.ItemSpacing.y * (center_y_ratio - 0.5f) * 2.0f); // Precisely aim above, in the middle or below the last line.
ImGui::SetScrollFromPosY(target_y - window->Pos.y, center_y_ratio);
}
void ImGui::SetKeyboardFocusHere(int offset)
{
ImGuiWindow* window = GetCurrentWindow();
@ -7751,7 +7762,7 @@ bool ImGui::Combo(const char* label, int* current_item, bool (*items_getter)(voi
*current_item = i;
}
if (item_selected && menu_toggled)
ImGui::SetScrollPosHere();
ImGui::SetScrollFromCursorPos();
ImGui::PopID();
}
ImGui::EndPopup();
@ -11300,10 +11311,10 @@ void ImGui::ShowTestWindow(bool* opened)
{
ImGui::Text("%04d: scrollable region", i);
if (goto_line && line == i)
ImGui::SetScrollPosHere();
ImGui::SetScrollFromCursorPos();
}
if (goto_line && line >= 100)
ImGui::SetScrollPosHere();
ImGui::SetScrollFromCursorPos();
ImGui::EndChild();
ImGui::SameLine();
@ -11497,11 +11508,14 @@ void ImGui::ShowTestWindow(bool* opened)
if (ImGui::TreeNode("Scrolling"))
{
ImGui::TextWrapped("Use SetScrollPosHere() to scroll to a given position.");
ImGui::TextWrapped("Use SetScrollFromPos() or SetScrollFromCursorPos() to scroll to a given position.");
static bool track = true;
static int track_line = 50;
static int track_line = 50, scroll_to_px = 200;
ImGui::Checkbox("Track", &track);
ImGui::SameLine(); ImGui::SliderInt("##line", &track_line, 0, 99, "Line %.0f");
ImGui::SameLine(130); track |= ImGui::DragInt("##line", &track_line, 0.25f, 0, 9999, "Line %.0f");
bool scroll_to = ImGui::Button("Scroll To");
ImGui::SameLine(130); scroll_to |= ImGui::DragInt("##pos_y", &scroll_to_px, 1.00f, 0, 9999, "y = %.0f px");
if (scroll_to) track = false;
for (int i = 0; i < 3; i++)
{
@ -11509,11 +11523,13 @@ void ImGui::ShowTestWindow(bool* opened)
ImGui::BeginGroup();
ImGui::Text(i == 0 ? "Top" : i == 1 ? "Center" : "Bottom");
ImGui::BeginChild(ImGui::GetID((void *)i), ImVec2(ImGui::GetWindowWidth() * 0.25f, 200.0f), true);
if (scroll_to)
ImGui::SetScrollFromPosY(ImGui::GetCursorStartPos().y + scroll_to_px, i * 0.50f);
for (int line = 0; line < 100; line++)
{
ImGui::Text("Line %d", line);
if (track && line == track_line)
ImGui::SetScrollPosHere(i * 0.50f); // 0.0f,0.5f,1.0f
ImGui::SetScrollFromCursorPos(i * 0.50f); // 0.0f:top, 0.5f:center, 1.0f:bottom
}
ImGui::EndChild();
ImGui::EndGroup();
@ -12272,7 +12288,7 @@ struct ExampleAppConsole
ImGui::PopStyleColor();
}
if (ScrollToBottom)
ImGui::SetScrollPosHere();
ImGui::SetScrollFromCursorPos();
ScrollToBottom = false;
ImGui::PopStyleVar();
ImGui::EndChild();

9
imgui.h
View File

@ -135,9 +135,11 @@ namespace ImGui
IMGUI_API void SetWindowCollapsed(const char* name, bool collapsed, ImGuiSetCond cond = 0); // set named window collapsed state
IMGUI_API void SetWindowFocus(const char* name); // set named window to be focused / front-most. use NULL to remove focus.
IMGUI_API float GetScrollY(); // get scrolling position [0..GetScrollMaxY()]
IMGUI_API float GetScrollMaxY(); // get maximum scrolling position == ContentSize.Y - WindowSize.Y
IMGUI_API void SetScrollPosHere(float center_y_ratio = 0.5f); // adjust scrolling position to make the current cursor position visible. center_y_ratio=0.0: top, =0.5: center, =1.0: bottom.
IMGUI_API float GetScrollY(); // get scrolling amount [0..GetScrollMaxY()]
IMGUI_API float GetScrollMaxY(); // get maximum scrolling amount == ContentSize.Y - WindowSize.Y
IMGUI_API void SetScrollY(float scroll_y); // set scrolling amount [0..GetScrollMaxY()]
IMGUI_API void SetScrollFromCursorPos(float center_y_ratio = 0.5f); // adjust scrolling amount to make current cursor position visible. center_y_ratio=0.0: top, 0.5: center, 1.0: bottom.
IMGUI_API void SetScrollFromPosY(float pos_y, float center_y_ratio = 0.5f); // adjust scrolling amount to make given position valid. use GetCursorPos() or GetCursorStartPos()+offset to get valid positions.
IMGUI_API void SetKeyboardFocusHere(int offset = 0); // focus keyboard on the next widget. Use positive 'offset' to access sub components of a multiple component widget
IMGUI_API void SetStateStorage(ImGuiStorage* tree); // replace tree state storage with our own (if you want to manipulate it yourself, typically clear subsection of it)
IMGUI_API ImGuiStorage* GetStateStorage();
@ -409,6 +411,7 @@ namespace ImGui
static inline bool IsClipped(const ImVec2& size) { return !IsRectVisible(size); } // OBSOLETE 1.38+
static inline bool IsRectClipped(const ImVec2& size) { return !IsRectVisible(size); } // OBSOLETE 1.39+
static inline bool IsMouseHoveringBox(const ImVec2& rect_min, const ImVec2& rect_max) { return IsMouseHoveringRect(rect_min, rect_max); } // OBSOLETE 1.36+
static inline void SetScrollPosHere() { SetScrollFromCursorPos(); } // OBSOLETE 1.42+
#endif
} // namespace ImGui