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InputText: Implement double/triple-click + drag word/line selection

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Select word/line on double/triple click was already implemented but
holding down the last click and dragging the mouse to incrementally
select was not.

To do this, `ImGuiInputTextState` keeps track of the current selection
mode (based on the number of mouse clicks) and the originating cursor
position over which the clicks happened. Later, on mouse moves, the
appropriate selection for mouse position and origin gets constructed.
This commit is contained in:
ronak69 2024-10-01 16:45:44 +00:00
parent 004f03945f
commit 46fa733be8
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2 changed files with 55 additions and 1 deletions
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2
imgui_internal.h
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@ -1119,6 +1119,8 @@ struct IMGUI_API ImGuiInputTextState
bool ReloadUserBuf; // force a reload of user buf so it may be modified externally. may be automatic in future version.
int ReloadSelectionStart; // POSITIONS ARE IN IMWCHAR units *NOT* UTF-8 this is why this is not exposed yet.
int ReloadSelectionEnd;
int SelectionClicks; // double/triple-click word/line selection mode.
int SelectionOrigin; // char-index/cursor-position under the mouse click that started current selection.
ImGuiInputTextState();
~ImGuiInputTextState();

54
imgui_widgets.cpp
View File

@ -4631,6 +4631,9 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
const int multiclick_count = (io.MouseClickedCount[0] - 2);
if ((multiclick_count % 2) == 0)
{
state->SelectionClicks = 2;
state->SelectionOrigin = state->Stb->cursor;
// Double-click: Select word
// We always use the "Mac" word advance for double-click select vs CTRL+Right which use the platform dependent variant:
// FIXME: There are likely many ways to improve this behavior, but there's no "right" behavior (depends on use-case, software, OS)
@ -4646,6 +4649,10 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
}
else
{
// No line-selection mode for single line, fallback to word selection
state->SelectionClicks = is_multiline ? 3 : 2;
state->SelectionOrigin = state->Stb->cursor;
// Triple-click: Select line
const bool is_eol = ImStb::STB_TEXTEDIT_GETCHAR(state, state->Stb->cursor) == '\n';
state->OnKeyPressed(STB_TEXTEDIT_K_LINESTART);
@ -4673,12 +4680,57 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
}
else if (io.MouseDown[0] && !state->SelectedAllMouseLock && (io.MouseDelta.x != 0.0f || io.MouseDelta.y != 0.0f))
{
stb_textedit_drag(state, state->Stb, mouse_x, mouse_y);
if (state->SelectionClicks >= 2)
{
// Double/Triple-click + drag incremental word/line selection
int origin = state->SelectionOrigin;
int drag = ImStb::stb_text_locate_coord(state, mouse_x, mouse_y);
const bool swap = drag < origin;
if (swap)
ImSwap(drag, origin);
if (state->SelectionClicks == 2)
{
const bool move_left = !ImStb::is_word_boundary_from_right(state, origin);
state->Stb->select_start = move_left ? ImStb::STB_TEXTEDIT_MOVEWORDLEFT_IMPL(state, origin) : origin;
const bool move_right = !ImStb::is_word_boundary_from_left(state, drag);
state->Stb->select_end = move_right ? ImStb::STB_TEXTEDIT_MOVEWORDRIGHT_MAC(state, drag) : drag;
}
else if (state->SelectionClicks == 3)
{
while (origin > 0 && ImStb::STB_TEXTEDIT_GETCHAR(state, origin - 1) != ImStb::STB_TEXTEDIT_NEWLINE)
--origin;
int length = ImStb::STB_TEXTEDIT_STRINGLEN(state);
while (drag < length && ImStb::STB_TEXTEDIT_GETCHAR(state, drag) != ImStb::STB_TEXTEDIT_NEWLINE)
++drag;
if (drag != length)
++drag;
state->Stb->select_start = origin;
state->Stb->select_end = drag;
}
if (swap)
ImSwap(state->Stb->select_start, state->Stb->select_end);
state->Stb->cursor = state->Stb->select_end;
}
else
{
stb_textedit_drag(state, state->Stb, mouse_x, mouse_y);
}
state->CursorAnimReset();
state->CursorFollow = true;
}
if (state->SelectedAllMouseLock && !io.MouseDown[0])
state->SelectedAllMouseLock = false;
// End ongoing multi-click selection on mouse-up or selection text replace
if (state->SelectionClicks >= 2 && !(io.MouseDown[0] && state->HasSelection()))
state->SelectionClicks = 0;
// We expect backends to emit a Tab key but some also emit a Tab character which we ignore (#2467, #1336)
// (For Tab and Enter: Win32/SFML/Allegro are sending both keys and chars, GLFW and SDL are only sending keys. For Space they all send all threes)